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stasis/je-7.5.11/docs/java/com/sleepycat/je/Environment.html
Greg Burd 1d088e4a23 initial import
2019-06-25 16:12:40 -04:00

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<title>Environment (Oracle - Berkeley DB Java Edition API)</title>
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<div class="aboutLanguage"><b>Berkeley DB Java Edition</b><br><font size=\"-1\"> version 7.5.11</font>
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<div class="subTitle">com.sleepycat.je</div>
<h2 title="Class Environment" class="title">Class Environment</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>com.sleepycat.je.Environment</li>
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<dd>java.io.Closeable, java.lang.AutoCloseable</dd>
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<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../com/sleepycat/je/rep/ReplicatedEnvironment.html" title="class in com.sleepycat.je.rep">ReplicatedEnvironment</a>, <a href="../../../com/sleepycat/je/XAEnvironment.html" title="class in com.sleepycat.je">XAEnvironment</a></dd>
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<pre>public class <span class="typeNameLabel">Environment</span>
extends java.lang.Object
implements java.io.Closeable</pre>
<div class="block">A database environment. Environments include support for some or all of
caching, locking, logging and transactions.
<p>To open an existing environment with default attributes the application
may use a default environment configuration object or null:
<blockquote>
<pre>
// Open an environment handle with default attributes.
Environment env = new Environment(home, new EnvironmentConfig());
</pre>
</blockquote>
or
<blockquote><pre>
Environment env = new Environment(home, null);
</pre></blockquote>
<p>Note that many Environment objects may access a single environment.</p>
<p>To create an environment or customize attributes, the application should
customize the configuration class. For example:</p>
<blockquote><pre>
EnvironmentConfig envConfig = new EnvironmentConfig();
envConfig.setTransactional(true);
envConfig.setAllowCreate(true);
envConfig.setCacheSize(1000000);
Environment newlyCreatedEnv = new Environment(home, envConfig);
</pre></blockquote>
<p>Note that environment configuration parameters can also be set through
the &lt;environment home&gt;/je.properties file. This file takes precedence
over any programmatically specified configuration parameters so that
configuration changes can be made without recompiling. Environment
configuration follows this order of precedence:</p>
<ol>
<li>Configuration parameters specified in
&lt;environment home&gt;/je.properties take first precedence.
<li> Configuration parameters set in the EnvironmentConfig object used at
Environment construction e tameters not set by the application are set to
system defaults, described along with the parameter name String constants
in the EnvironmentConfig class.
</ol>
<p>An <em>environment handle</em> is an Environment instance. More than one
Environment instance may be created for the same physical directory, which
is the same as saying that more than one Environment handle may be open at
one time for a given environment.</p>
The Environment handle should not be closed while any other handle remains
open that is using it as a reference (for example, <a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je"><code>Database</code></a> or <a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je"><code>Transaction</code></a>. Once <a href="../../../com/sleepycat/je/Environment.html#close--"><code>Environment.close</code></a> is called, this object may not be accessed again.</div>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#Environment-java.io.File-com.sleepycat.je.EnvironmentConfig-">Environment</a></span>(java.io.File&nbsp;envHome,
<a href="../../../com/sleepycat/je/EnvironmentConfig.html" title="class in com.sleepycat.je">EnvironmentConfig</a>&nbsp;configuration)</code>
<div class="block">Creates a database environment handle.</div>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#beginTransaction-com.sleepycat.je.Transaction-com.sleepycat.je.TransactionConfig-">beginTransaction</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;parent,
<a href="../../../com/sleepycat/je/TransactionConfig.html" title="class in com.sleepycat.je">TransactionConfig</a>&nbsp;txnConfig)</code>
<div class="block">Creates a new transaction in the database environment.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#checkpoint-com.sleepycat.je.CheckpointConfig-">checkpoint</a></span>(<a href="../../../com/sleepycat/je/CheckpointConfig.html" title="class in com.sleepycat.je">CheckpointConfig</a>&nbsp;ckptConfig)</code>
<div class="block">Synchronously checkpoint the database environment.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#cleanLog--">cleanLog</a></span>()</code>
<div class="block">Synchronously invokes log file (data file) cleaning until the target
disk space utilization has been reached; this method is called
periodically by the cleaner background threads.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#cleanLogFile--">cleanLogFile</a></span>()</code>
<div class="block">Synchronously invokes cleaning of a single log file (data file), if
the target disk space utilization has not been reached.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#close--">close</a></span>()</code>
<div class="block">The Environment.close method closes the Berkeley DB environment.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#compress--">compress</a></span>()</code>
<div class="block">Synchronously invokes the compressor mechanism which compacts in memory
data structures after delete operations.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#evictMemory--">evictMemory</a></span>()</code>
<div class="block">Synchronously invokes the mechanism for keeping memory usage within the
cache size boundaries.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#flushLog-boolean-">flushLog</a></span>(boolean&nbsp;fsync)</code>
<div class="block">Writes buffered data to the log, and optionally performs an fsync to
guarantee that data is written to the physical device.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/EnvironmentConfig.html" title="class in com.sleepycat.je">EnvironmentConfig</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#getConfig--">getConfig</a></span>()</code>
<div class="block">Returns this object's configuration.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>java.util.List&lt;java.lang.String&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#getDatabaseNames--">getDatabaseNames</a></span>()</code>
<div class="block">Returns a List of database names for the database environment.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>java.io.File</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#getHome--">getHome</a></span>()</code>
<div class="block">Returns the database environment's home directory.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#getInvalidatingException--">getInvalidatingException</a></span>()</code>
<div class="block">Returns the exception that caused the environment to be invalidated, or
null if the environment was not invalidated by an exception.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/LockStats.html" title="class in com.sleepycat.je">LockStats</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#getLockStats-com.sleepycat.je.StatsConfig-">getLockStats</a></span>(<a href="../../../com/sleepycat/je/StatsConfig.html" title="class in com.sleepycat.je">StatsConfig</a>&nbsp;config)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">as of 4.0.10, replaced by <a href="../../../com/sleepycat/je/Environment.html#getStats-com.sleepycat.je.StatsConfig-"><code>getStats(StatsConfig)</code></a>.</p></span></div>
</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/EnvironmentMutableConfig.html" title="class in com.sleepycat.je">EnvironmentMutableConfig</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#getMutableConfig--">getMutableConfig</a></span>()</code>
<div class="block">Returns database environment attributes.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/EnvironmentStats.html" title="class in com.sleepycat.je">EnvironmentStats</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#getStats-com.sleepycat.je.StatsConfig-">getStats</a></span>(<a href="../../../com/sleepycat/je/StatsConfig.html" title="class in com.sleepycat.je">StatsConfig</a>&nbsp;config)</code>
<div class="block">Returns the general database environment statistics.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#getThreadTransaction--">getThreadTransaction</a></span>()</code>
<div class="block">Returns the transaction associated with this thread if implied
transactions are being used.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/TransactionStats.html" title="class in com.sleepycat.je">TransactionStats</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#getTransactionStats-com.sleepycat.je.StatsConfig-">getTransactionStats</a></span>(<a href="../../../com/sleepycat/je/StatsConfig.html" title="class in com.sleepycat.je">StatsConfig</a>&nbsp;config)</code>
<div class="block">Returns the database environment's transactional statistics.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#isClosed--">isClosed</a></span>()</code>
<div class="block">Returns whether the environment has been closed by the application.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#isInternalHandle--">isInternalHandle</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#isValid--">isValid</a></span>()</code>
<div class="block">Returns whether this <code>Environment</code> is open, valid and can be used.</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#openDatabase-com.sleepycat.je.Transaction-java.lang.String-com.sleepycat.je.DatabaseConfig-">openDatabase</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;txn,
java.lang.String&nbsp;databaseName,
<a href="../../../com/sleepycat/je/DatabaseConfig.html" title="class in com.sleepycat.je">DatabaseConfig</a>&nbsp;dbConfig)</code>
<div class="block">Opens, and optionally creates, a <code>Database</code>.</div>
</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/DiskOrderedCursor.html" title="class in com.sleepycat.je">DiskOrderedCursor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#openDiskOrderedCursor-com.sleepycat.je.Database:A-com.sleepycat.je.DiskOrderedCursorConfig-">openDiskOrderedCursor</a></span>(<a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a>[]&nbsp;databases,
<a href="../../../com/sleepycat/je/DiskOrderedCursorConfig.html" title="class in com.sleepycat.je">DiskOrderedCursorConfig</a>&nbsp;config)</code>
<div class="block">Create a DiskOrderedCursor to iterate over the records of a given set
of databases.</div>
</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/SecondaryDatabase.html" title="class in com.sleepycat.je">SecondaryDatabase</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#openSecondaryDatabase-com.sleepycat.je.Transaction-java.lang.String-com.sleepycat.je.Database-com.sleepycat.je.SecondaryConfig-">openSecondaryDatabase</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;txn,
java.lang.String&nbsp;databaseName,
<a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a>&nbsp;primaryDatabase,
<a href="../../../com/sleepycat/je/SecondaryConfig.html" title="class in com.sleepycat.je">SecondaryConfig</a>&nbsp;dbConfig)</code>
<div class="block">Opens and optionally creates a <code>SecondaryDatabase</code>.</div>
</td>
</tr>
<tr id="i23" class="rowColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/PreloadStats.html" title="class in com.sleepycat.je">PreloadStats</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#preload-com.sleepycat.je.Database:A-com.sleepycat.je.PreloadConfig-">preload</a></span>(<a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a>[]&nbsp;databases,
<a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a>&nbsp;config)</code>
<div class="block">Preloads the cache with multiple databases.</div>
</td>
</tr>
<tr id="i24" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#printStartupInfo-java.io.PrintStream-">printStartupInfo</a></span>(java.io.PrintStream&nbsp;out)</code>
<div class="block">Print a detailed report about the costs of different phases of
environment startup.</div>
</td>
</tr>
<tr id="i25" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#removeDatabase-com.sleepycat.je.Transaction-java.lang.String-">removeDatabase</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;txn,
java.lang.String&nbsp;databaseName)</code>
<div class="block">Removes a database from the environment, discarding all records in the
database and removing the database name itself.</div>
</td>
</tr>
<tr id="i26" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#renameDatabase-com.sleepycat.je.Transaction-java.lang.String-java.lang.String-">renameDatabase</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;txn,
java.lang.String&nbsp;databaseName,
java.lang.String&nbsp;newName)</code>
<div class="block">Renames a database, without removing the records it contains.</div>
</td>
</tr>
<tr id="i27" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#setMutableConfig-com.sleepycat.je.EnvironmentMutableConfig-">setMutableConfig</a></span>(<a href="../../../com/sleepycat/je/EnvironmentMutableConfig.html" title="class in com.sleepycat.je">EnvironmentMutableConfig</a>&nbsp;mutableConfig)</code>
<div class="block">Sets database environment attributes.</div>
</td>
</tr>
<tr id="i28" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#setThreadTransaction-com.sleepycat.je.Transaction-">setThreadTransaction</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;txn)</code>
<div class="block">Sets the transaction associated with this thread if implied transactions
are being used.</div>
</td>
</tr>
<tr id="i29" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#sync--">sync</a></span>()</code>
<div class="block">Synchronously flushes database environment databases to stable storage.</div>
</td>
</tr>
<tr id="i30" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#truncateDatabase-com.sleepycat.je.Transaction-java.lang.String-boolean-">truncateDatabase</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;txn,
java.lang.String&nbsp;databaseName,
boolean&nbsp;returnCount)</code>
<div class="block">Empties the database, discarding all the records it contains, without
removing the database name.</div>
</td>
</tr>
<tr id="i31" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Environment.html#verify-com.sleepycat.je.VerifyConfig-java.io.PrintStream-">verify</a></span>(<a href="../../../com/sleepycat/je/VerifyConfig.html" title="class in com.sleepycat.je">VerifyConfig</a>&nbsp;config,
java.io.PrintStream&nbsp;out)</code>
<div class="block">Returns if the database environment is consistent and correct.</div>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
</ul>
</li>
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<h4>Environment</h4>
<pre>public&nbsp;Environment(java.io.File&nbsp;envHome,
<a href="../../../com/sleepycat/je/EnvironmentConfig.html" title="class in com.sleepycat.je">EnvironmentConfig</a>&nbsp;configuration)
throws <a href="../../../com/sleepycat/je/EnvironmentNotFoundException.html" title="class in com.sleepycat.je">EnvironmentNotFoundException</a>,
<a href="../../../com/sleepycat/je/EnvironmentLockedException.html" title="class in com.sleepycat.je">EnvironmentLockedException</a>,
<a href="../../../com/sleepycat/je/VersionMismatchException.html" title="class in com.sleepycat.je">VersionMismatchException</a>,
<a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a>,
java.lang.IllegalArgumentException</pre>
<div class="block">Creates a database environment handle.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>envHome</code> - The database environment's home directory.</dd>
<dd><code>configuration</code> - The database environment attributes. If null,
default attributes are used.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentNotFoundException.html" title="class in com.sleepycat.je">EnvironmentNotFoundException</a></code> - if the environment does not exist
(does not contain at least one log file) and the <code>EnvironmentConfig AllowCreate</code> parameter is false.</dd>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentLockedException.html" title="class in com.sleepycat.je">EnvironmentLockedException</a></code> - when an environment cannot be opened
for write access because another process has the same environment open
for write access. <strong>Warning:</strong> This exception should be
handled when an environment is opened by more than one process.</dd>
<dd><code><a href="../../../com/sleepycat/je/VersionMismatchException.html" title="class in com.sleepycat.je">VersionMismatchException</a></code> - when the existing log is not compatible
with the version of JE that is running. This occurs when a later
version of JE was used to create the log. <strong>Warning:</strong>
This exception should be handled when more than one version of JE may be
used to access an environment.</dd>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.UnsupportedOperationException</code> - if this environment was previously
opened for replication and is not being opened read-only.</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if an invalid parameter is specified,
for example, an invalid <code>EnvironmentConfig</code> parameter.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
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<h4>close</h4>
<pre>public&nbsp;void&nbsp;close()
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">The Environment.close method closes the Berkeley DB environment.
<p>When the last environment handle is closed, allocated resources are
freed, and daemon threads are stopped, even if they are performing work.
For example, if the cleaner is still cleaning the log, it will be
stopped at the next reasonable opportunity and perform no more cleaning
operations. After stopping background threads, a final checkpoint is
performed by this method, in order to reduce the time to recover the
next time the environment is opened.</p>
<p>When minimizing recovery time is desired, it is often useful to stop
all application activity and perform an additional checkpoint prior to
calling <code>close</code>. This additional checkpoint will write most of
dirty Btree information, so that that the final checkpoint is very
small (and recovery is fast). To ensure that recovery time is minimized,
the log cleaner threads should also be stopped prior to the extra
checkpoint. This prevents log cleaning from dirtying the Btree, which
can make the final checkpoint larger (and recovery time longer). The
recommended procedure for minimizing recovery time is:</p>
<pre>
// Stop/finish all application operations that are using JE.
...
// Stop the cleaner daemon threads.
EnvironmentMutableConfig config = env.getMutableConfig();
config.setConfigParam(EnvironmentConfig.ENV_RUN_CLEANER, "false");
env.setMutableConfig(config);
// Perform an extra checkpoint
env.checkpoint(new CheckpointConfig().setForce(true));
// Finally, close the environment.
env.close();
</pre>
<p>The Environment handle should not be closed while any other handle
that refers to it is not yet closed; for example, database environment
handles must not be closed while database handles remain open, or
transactions in the environment have not yet committed or aborted.
Specifically, this includes <a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je"><code>Database</code></a>,
and <a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je"><code>Transaction</code></a> handles.</p>
<p>If this handle has already been closed, this method does nothing and
returns without throwing an exception.</p>
<p>In multithreaded applications, only a single thread should call
Environment.close.</p>
<p>The environment handle may not be used again after this method has
been called, regardless of the method's success or failure, with one
exception: the <code>close</code> method itself may be called any number of
times.</p>
<p>WARNING: To guard against memory leaks, the application should
discard all references to the closed handle. While BDB makes an effort
to discard references from closed objects to the allocated memory for an
environment, this behavior is not guaranteed. The safe course of action
for an application is to discard all references to closed BDB
objects.</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>close</code>&nbsp;in interface&nbsp;<code>java.io.Closeable</code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>close</code>&nbsp;in interface&nbsp;<code>java.lang.AutoCloseable</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentWedgedException.html" title="class in com.sleepycat.je">EnvironmentWedgedException</a></code> - when the current process must be
shut down and restarted before re-opening the Environment.</dd>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code><a href="../../../com/sleepycat/je/DiskLimitException.html" title="class in com.sleepycat.je">DiskLimitException</a></code> - if the final checkpoint cannot be performed
because a disk limit has been violated. The Environment will be closed,
but this exception will be thrown so that the application is aware that
a checkpoint was not performed.</dd>
<dd><code>java.lang.IllegalStateException</code> - if any open databases or transactions
refer to this handle. The Environment will be closed, but this exception
will be thrown so that the application is aware that not all databases
and transactions were closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
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<h4>openDatabase</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a>&nbsp;openDatabase(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;txn,
java.lang.String&nbsp;databaseName,
<a href="../../../com/sleepycat/je/DatabaseConfig.html" title="class in com.sleepycat.je">DatabaseConfig</a>&nbsp;dbConfig)
throws <a href="../../../com/sleepycat/je/DatabaseNotFoundException.html" title="class in com.sleepycat.je">DatabaseNotFoundException</a>,
<a href="../../../com/sleepycat/je/DatabaseExistsException.html" title="class in com.sleepycat.je">DatabaseExistsException</a>,
java.lang.IllegalArgumentException,
java.lang.IllegalStateException</pre>
<div class="block">Opens, and optionally creates, a <code>Database</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>txn</code> - For a transactional database, an explicit transaction may be
specified, or null may be specified to use auto-commit. For a
non-transactional database, null must be specified.</dd>
<dd><code>databaseName</code> - The name of the database.</dd>
<dd><code>dbConfig</code> - The database attributes. If null, default attributes
are used.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Database handle.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/DatabaseExistsException.html" title="class in com.sleepycat.je">DatabaseExistsException</a></code> - if the database already exists and the
<code>DatabaseConfig ExclusiveCreate</code> parameter is true.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseNotFoundException.html" title="class in com.sleepycat.je">DatabaseNotFoundException</a></code> - if the database does not exist and the
<code>DatabaseConfig AllowCreate</code> parameter is false.</dd>
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
href="../je/OperationFailureException.html#readFailures">Read Operation
Failures</a> occurs. If the database does not exist and the <a href="../../../com/sleepycat/je/DatabaseConfig.html#setAllowCreate-boolean-"><code>AllowCreate</code></a> parameter is true, then one
of the <a
href="../je/OperationFailureException.html#writeFailures">Write
Operation Failures</a> may also occur.</dd>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if an invalid parameter is specified,
for example, an invalid <code>DatabaseConfig</code> property.</dd>
<dd><code>java.lang.IllegalStateException</code> - if DatabaseConfig properties are changed
and there are other open handles for this database.</dd>
</dl>
</li>
</ul>
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<h4>openSecondaryDatabase</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/SecondaryDatabase.html" title="class in com.sleepycat.je">SecondaryDatabase</a>&nbsp;openSecondaryDatabase(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;txn,
java.lang.String&nbsp;databaseName,
<a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a>&nbsp;primaryDatabase,
<a href="../../../com/sleepycat/je/SecondaryConfig.html" title="class in com.sleepycat.je">SecondaryConfig</a>&nbsp;dbConfig)
throws <a href="../../../com/sleepycat/je/DatabaseNotFoundException.html" title="class in com.sleepycat.je">DatabaseNotFoundException</a>,
<a href="../../../com/sleepycat/je/DatabaseExistsException.html" title="class in com.sleepycat.je">DatabaseExistsException</a>,
<a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a>,
java.lang.IllegalArgumentException,
java.lang.IllegalStateException</pre>
<div class="block">Opens and optionally creates a <code>SecondaryDatabase</code>.
<p>Note that the associations between primary and secondary databases
are not stored persistently. Whenever a primary database is opened for
write access by the application, the appropriate associated secondary
databases should also be opened by the application. This is necessary
to ensure data integrity when changes are made to the primary
database.</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>txn</code> - For a transactional database, an explicit transaction may be
specified, or null may be specified to use auto-commit. For a
non-transactional database, null must be specified.</dd>
<dd><code>databaseName</code> - The name of the database.</dd>
<dd><code>primaryDatabase</code> - the primary database with which the secondary
database will be associated. The primary database must not be
configured for duplicates.</dd>
<dd><code>dbConfig</code> - The secondary database attributes. If null, default
attributes are used.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Database handle.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/DatabaseExistsException.html" title="class in com.sleepycat.je">DatabaseExistsException</a></code> - if the database already exists and the
<code>DatabaseConfig ExclusiveCreate</code> parameter is true.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseNotFoundException.html" title="class in com.sleepycat.je">DatabaseNotFoundException</a></code> - if the database does not exist and the
<code>DatabaseConfig AllowCreate</code> parameter is false.</dd>
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
href="../je/OperationFailureException.html#readFailures">Read Operation
Failures</a> occurs. If the database does not exist and the <a href="../../../com/sleepycat/je/DatabaseConfig.html#setAllowCreate-boolean-"><code>AllowCreate</code></a> parameter is true, then one
of the <a
href="../je/OperationFailureException.html#writeFailures">Write
Operation Failures</a> may also occur.</dd>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if an invalid parameter is specified,
for example, an invalid <code>SecondaryConfig</code> property.</dd>
<dd><code>java.lang.IllegalStateException</code> - if DatabaseConfig properties are changed
and there are other open handles for this database.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
</ul>
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<h4>removeDatabase</h4>
<pre>public&nbsp;void&nbsp;removeDatabase(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;txn,
java.lang.String&nbsp;databaseName)
throws <a href="../../../com/sleepycat/je/DatabaseNotFoundException.html" title="class in com.sleepycat.je">DatabaseNotFoundException</a></pre>
<div class="block">Removes a database from the environment, discarding all records in the
database and removing the database name itself.
<p>Compared to deleting all the records in a database individually,
<code>removeDatabase</code> is a very efficient operation. Some internal
housekeeping information is updated, but the database records are not
read or written, and very little I/O is needed.</p>
<p>When called on a database configured with secondary indices, the
application is responsible for also removing all associated secondary
indices. To guarantee integrity, a primary database and all of its
secondary databases should be removed atomically using a single
transaction.</p>
<p>Applications should not remove a database with open <a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je"><code>Database</code></a> handles. If the database is open with the same transaction as
passed in the <code>txn</code> parameter, <code>IllegalStateException</code> is
thrown by this method. If the database is open using a different
transaction, this method will block until all database handles are
closed, or until the conflict is resolved by throwing <a href="../../../com/sleepycat/je/LockConflictException.html" title="class in com.sleepycat.je"><code>LockConflictException</code></a>.</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>txn</code> - For a transactional environment, an explicit transaction
may be specified or null may be specified to use auto-commit. For a
non-transactional environment, null must be specified.</dd>
<dd><code>databaseName</code> - The database to be removed.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/DatabaseNotFoundException.html" title="class in com.sleepycat.je">DatabaseNotFoundException</a></code> - if the database does not exist.</dd>
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
href="../je/OperationFailureException.html#writeFailures">Write
Operation Failures</a> occurs.</dd>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.UnsupportedOperationException</code> - if this is a read-only
environment.</dd>
<dd><code>java.lang.IllegalStateException</code> - if the database is currently open using
the transaction passed in the <code>txn</code> parameter, or if this handle
or the underlying environment has been closed.</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if an invalid parameter is specified.</dd>
</dl>
</li>
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<h4>renameDatabase</h4>
<pre>public&nbsp;void&nbsp;renameDatabase(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;txn,
java.lang.String&nbsp;databaseName,
java.lang.String&nbsp;newName)
throws <a href="../../../com/sleepycat/je/DatabaseNotFoundException.html" title="class in com.sleepycat.je">DatabaseNotFoundException</a></pre>
<div class="block">Renames a database, without removing the records it contains.
<p>Applications should not rename a database with open <a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je"><code>Database</code></a> handles. If the database is open with the same transaction as
passed in the <code>txn</code> parameter, <code>IllegalStateException</code> is
thrown by this method. If the database is open using a different
transaction, this method will block until all database handles are
closed, or until the conflict is resolved by throwing <a href="../../../com/sleepycat/je/LockConflictException.html" title="class in com.sleepycat.je"><code>LockConflictException</code></a>.</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>txn</code> - For a transactional environment, an explicit transaction
may be specified or null may be specified to use auto-commit. For a
non-transactional environment, null must be specified.</dd>
<dd><code>databaseName</code> - The new name of the database.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/DatabaseNotFoundException.html" title="class in com.sleepycat.je">DatabaseNotFoundException</a></code> - if the database does not exist.</dd>
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
href="../je/OperationFailureException.html#writeFailures">Write
Operation Failures</a> occurs.</dd>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.UnsupportedOperationException</code> - if this is a read-only
environment.</dd>
<dd><code>java.lang.IllegalStateException</code> - if the database is currently open using
the transaction passed in the <code>txn</code> parameter, or if this handle
or the underlying environment has been closed.</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if an invalid parameter is specified.</dd>
</dl>
</li>
</ul>
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<h4>truncateDatabase</h4>
<pre>public&nbsp;long&nbsp;truncateDatabase(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;txn,
java.lang.String&nbsp;databaseName,
boolean&nbsp;returnCount)
throws <a href="../../../com/sleepycat/je/DatabaseNotFoundException.html" title="class in com.sleepycat.je">DatabaseNotFoundException</a></pre>
<div class="block">Empties the database, discarding all the records it contains, without
removing the database name.
<p>Compared to deleting all the records in a database individually,
<code>truncateDatabase</code> is a very efficient operation. Some internal
housekeeping information is updated, but the database records are not
read or written, and very little I/O is needed.</p>
<p>When called on a database configured with secondary indices, the
application is responsible for also truncating all associated secondary
indices. To guarantee integrity, a primary database and all of its
secondary databases should be truncated atomically using a single
transaction.</p>
<p>Applications should not truncate a database with open <a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je"><code>Database</code></a> handles. If the database is open with the same transaction as
passed in the <code>txn</code> parameter, <code>IllegalStateException</code> is
thrown by this method. If the database is open using a different
transaction, this method will block until all database handles are
closed, or until the conflict is resolved by throwing <a href="../../../com/sleepycat/je/LockConflictException.html" title="class in com.sleepycat.je"><code>LockConflictException</code></a>.</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>txn</code> - For a transactional environment, an explicit transaction may
be specified or null may be specified to use auto-commit. For a
non-transactional environment, null must be specified.</dd>
<dd><code>databaseName</code> - The database to be truncated.</dd>
<dd><code>returnCount</code> - If true, count and return the number of records
discarded.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The number of records discarded, or -1 if returnCount is false.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/DatabaseNotFoundException.html" title="class in com.sleepycat.je">DatabaseNotFoundException</a></code> - if the database does not exist.</dd>
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
href="../je/OperationFailureException.html#writeFailures">Write
Operation Failures</a> occurs.</dd>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.UnsupportedOperationException</code> - if this is a read-only
environment.</dd>
<dd><code>java.lang.IllegalStateException</code> - if the database is currently open using
the transaction passed in the <code>txn</code> parameter, or if this handle
or the underlying environment has been closed.</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if an invalid parameter is specified.</dd>
</dl>
</li>
</ul>
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<h4>getHome</h4>
<pre>public&nbsp;java.io.File&nbsp;getHome()
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Returns the database environment's home directory.
This method may be called when the environment has been invalidated, but
not yet closed. In other words, <a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je"><code>EnvironmentFailureException</code></a> is
never thrown by this method.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The database environment's home directory.
environment-wide failure occurs.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code> - if this handle has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
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<pre>public&nbsp;<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;beginTransaction(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;parent,
<a href="../../../com/sleepycat/je/TransactionConfig.html" title="class in com.sleepycat.je">TransactionConfig</a>&nbsp;txnConfig)
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a>,
java.lang.IllegalArgumentException</pre>
<div class="block">Creates a new transaction in the database environment.
<p>Transaction handles are free-threaded; transactions handles may be
used concurrently by multiple threads.</p>
<p>Cursors may not span transactions; that is, each cursor must be
opened and closed within a single transaction. The parent parameter is a
placeholder for nested transactions, and must currently be null.</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>txnConfig</code> - The transaction attributes. If null, default
attributes are used.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The newly created transaction's handle.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/rep/InsufficientReplicasException.html" title="class in com.sleepycat.je.rep">InsufficientReplicasException</a></code> - if the Master
in a replicated environment could not contact a quorum of replicas as
determined by the <a href="../../../com/sleepycat/je/Durability.ReplicaAckPolicy.html" title="enum in com.sleepycat.je"><code>Durability.ReplicaAckPolicy</code></a>.</dd>
<dd><code><a href="../../../com/sleepycat/je/rep/ReplicaConsistencyException.html" title="class in com.sleepycat.je.rep">ReplicaConsistencyException</a></code> - if a replica
in a replicated environment cannot become consistent within the timeout
period.</dd>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.UnsupportedOperationException</code> - if this is not a transactional
environment.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if an invalid parameter is specified,
for example, an invalid <code>TransactionConfig</code> parameter.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
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<pre>public&nbsp;void&nbsp;checkpoint(<a href="../../../com/sleepycat/je/CheckpointConfig.html" title="class in com.sleepycat.je">CheckpointConfig</a>&nbsp;ckptConfig)
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Synchronously checkpoint the database environment.
<p>
This is an optional action for the application since this activity
is, by default, handled by a database environment owned background
thread.
<p>
A checkpoint has the side effect of flushing all preceding
non-transactional write operations, as well as any preceding
transactions that were committed with <a href="../../../com/sleepycat/je/Durability.SyncPolicy.html#NO_SYNC"><code>no-sync durability</code></a>. However, for best
performance, checkpoints should be used only to bound recovery time.
<a href="../../../com/sleepycat/je/Environment.html#flushLog-boolean-"><code>flushLog(boolean)</code></a> can be used to write buffered data for durability
purposes.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>ckptConfig</code> - The checkpoint attributes. If null, default
attributes are used.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code><a href="../../../com/sleepycat/je/DiskLimitException.html" title="class in com.sleepycat.je">DiskLimitException</a></code> - if the checkpoint cannot be performed
because a disk limit has been violated.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
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<pre>public&nbsp;void&nbsp;sync()
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Synchronously flushes database environment databases to stable storage.
Calling this method is equivalent to forcing a checkpoint and setting
<a href="../../../com/sleepycat/je/CheckpointConfig.html#setMinimizeRecoveryTime-boolean-"><code>CheckpointConfig.setMinimizeRecoveryTime(boolean)</code></a> to true.
<p>
A checkpoint has the side effect of flushing all preceding
non-transactional write operations, as well as any preceding
transactions that were committed with <a href="../../../com/sleepycat/je/Durability.SyncPolicy.html#NO_SYNC"><code>no-sync durability</code></a>. However, for best
performance, checkpoints should be used only to bound recovery time.
<a href="../../../com/sleepycat/je/Environment.html#flushLog-boolean-"><code>flushLog(boolean)</code></a> can be used to write buffered data for durability
purposes.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code><a href="../../../com/sleepycat/je/DiskLimitException.html" title="class in com.sleepycat.je">DiskLimitException</a></code> - if the sync cannot be performed
because a disk limit has been violated.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
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<pre>public&nbsp;void&nbsp;flushLog(boolean&nbsp;fsync)</pre>
<div class="block">Writes buffered data to the log, and optionally performs an fsync to
guarantee that data is written to the physical device.
<p>
This method is used to make durable, by writing to the log, all
preceding non-transactional write operations, as well as any preceding
transactions that were committed with <a href="../../../com/sleepycat/je/Durability.SyncPolicy.html#NO_SYNC"><code>no-sync durability</code></a>. If the <code>fsync</code>
parameter is true, it can also be used to flush all logged data to the
physical storage device, by performing an fsync.
<p>
Note that this method <em>does not</em> flush previously unwritten data
in deferred-write databases; that is done by calling <a href="../../../com/sleepycat/je/Database.html#sync--"><code>Database.sync()</code></a> or performing a checkpoint.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fsync</code> - is true to perform an fsync as well as a file write, or
false to perform only a file write.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
</dl>
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<pre>public&nbsp;int&nbsp;cleanLog()
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Synchronously invokes log file (data file) cleaning until the target
disk space utilization has been reached; this method is called
periodically by the cleaner background threads.
<p>Zero or more log files will be cleaned as necessary to bring the
current <a href="../../../com/sleepycat/je/EnvironmentStats.html#getCurrentMinUtilization--"><code>disk space
utilization</code></a> of the environment above the configured <a href="../../../com/sleepycat/je/EnvironmentConfig.html#CLEANER_MIN_UTILIZATION"><code>utilization threshold</code></a>.
<p>Note that this method does not perform the complete task of cleaning
a log file. Eviction and checkpointing log Btree information that is
marked dirty by the cleaner, and a full checkpoint is necessary,
following cleaning, before cleaned files will be deleted (or renamed).
Checkpoints occur periodically and when the environment is closed.</p>
<p>This is an optional action for the application since this activity
is, by default, handled by one or more Environment-owned background
threads.</p>
<p>The intended use case for the <code>cleanLog</code> method is when the
application wishes to disable the built-in cleaner threads using the
<a href="../../../com/sleepycat/je/EnvironmentConfig.html#ENV_RUN_CLEANER"><code>EnvironmentConfig.ENV_RUN_CLEANER</code></a> property. To replace the
functionality of the cleaner threads, the application should call
<code>cleanLog</code> periodically.</p>
<p>Note that because this method cleans multiple files before returning,
in an attempt to reach the target utilization, it may not return for a
long time when there is a large <a href="../../../com/sleepycat/je/EnvironmentStats.html#getCleanerBacklog--"><code>backlog</code></a> of files to be cleaned. This
method cannot be aborted except by closing the environment. If the
application needs the ability to abort the cleaning process, the
<a href="../../../com/sleepycat/je/Environment.html#cleanLogFile--"><code>cleanLogFile()</code></a> method should be used instead.</p>
<p>Note that in certain unusual situations the cleaner may not be able
to make forward progress and the target utilization will never be
reached. For example, this can occur if the target utilization is set
too high or checkpoints are performed too often. To guard against
cleaning "forever", this method will return when all files have been
cleaned, even when the target utilization has not been reached.</p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The number of log files that were cleaned, and that will be
deleted (or renamed) when a qualifying checkpoint occurs.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.UnsupportedOperationException</code> - if this is a read-only or
memory-only environment.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
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<pre>public&nbsp;boolean&nbsp;cleanLogFile()
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Synchronously invokes cleaning of a single log file (data file), if
the target disk space utilization has not been reached.
<p>One log file will be cleaned if the current <a href="../../../com/sleepycat/je/EnvironmentStats.html#getCurrentMinUtilization--"><code>disk space utilization</code></a> of the
environment is below the configured <a href="../../../com/sleepycat/je/EnvironmentConfig.html#CLEANER_MIN_UTILIZATION"><code>utilization threshold</code></a>. No
files will be cleaned if disk space utilization is currently above the
threshold. The lowest utilized file is selected for cleaning, since it
has the lowest cleaning cost.</p>
<p>Note that this method does not perform the complete task of cleaning
a log file. Eviction and checkpointing log Btree information that is
marked dirty by the cleaner, and a full checkpoint is necessary,
following cleaning, before cleaned files will be deleted (or renamed).
Checkpoints occur periodically and when the environment is closed.</p>
<p>The intended use case for the <code>cleanLog</code> method is "batch
cleaning". This is when the application disables the cleaner threads
(using the <a href="../../../com/sleepycat/je/EnvironmentConfig.html#ENV_RUN_CLEANER"><code>EnvironmentConfig.ENV_RUN_CLEANER</code></a> property)
for maximum performance during active periods, and calls <code>cleanLog</code> during periods when the application is quiescent or less
active than usual. Similarly, there may be times when an application
wishes to perform cleaning explicitly until the target utilization
rather than relying on the cleaner's background threads. For example,
some applications may wish to perform batch cleaning prior to closing
the environment, to reclaim as much disk space as possible at that
time.</p>
<p>To clean until the target utilization threshold is reached, <code>cleanLogFile</code> can be called in a loop until it returns <code>false</code>.
When there is a large <a href="../../../com/sleepycat/je/EnvironmentStats.html#getCleanerBacklog--"><code>backlog</code></a> of files to be cleaned, the application may wish to limit the
amount of cleaning. Batch cleaning can be aborted simply by breaking out
of the loop. The cleaning of a single file is not a long operation; it
should take several minutes at most. For example:</p>
<pre>
boolean cleaningAborted;
boolean anyCleaned = false;
while (!cleaningAborted && env.cleanLogFile()) {
anyCleaned = true;
}
</pre>
<p>Note that in certain unusual situations the cleaner may not be able
to make forward progress and the target utilization will never be
reached. For example, this can occur if the target utilization is set
too high or checkpoints are performed too often. To guard against
cleaning "forever", the application may wish to cancel the batch
cleaning (break out of the loop) when the cleaning time or number of
files cleaned exceeds some reasonable limit.</p>
<p>As mentioned above, the cleaned log files will not be deleted until
the next full checkpoint. If the application wishes to reclaim this disk
space as soon as possible, an explicit checkpoint may be performed after
the batch cleaning operation. For example:</p>
<pre>
if (anyCleaned) {
env.checkpoint(new CheckpointConfig().setForce(true));
}
</pre>
<p>However, even an explicit checkpoint is not guaranteed to delete the
cleaned log files if, at the time the file was cleaned, records in the
file were locked or were part of a database that was being removed, due
to concurrent application activity that was accessing records or
removing databases. In this case the files will be deleted only after
these operations are complete and a subsequent checkpoint is performed.
To guarantee that the cleaned files will be deleted, an application may
stop all concurrent activity (ensure all operations and transactions
have ended) and then perform a checkpoint.</p>
<p>When closing the environment and minimizing recovery time is desired
(see <a href="../../../com/sleepycat/je/Environment.html#close--"><code>close()</code></a>), as well as reclaiming disk space, the recommended
procedure is as follows:</p>
<pre>
// Stop/finish all application operations that are using JE.
...
// Stop the cleaner daemon threads.
EnvironmentMutableConfig config = env.getMutableConfig();
config.setConfigParam(EnvironmentConfig.ENV_RUN_CLEANER, "false");
env.setMutableConfig(config);
// Perform batch cleaning.
while (!cleaningAborted && env.cleanLogFile()) {
}
// Perform an extra checkpoint
env.checkpoint(new CheckpointConfig().setForce(true));
// Finally, close the environment.
env.close();
</pre></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if one log was cleaned, or false if none were cleaned.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.UnsupportedOperationException</code> - if this is a read-only or
memory-only environment.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
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<pre>public&nbsp;void&nbsp;evictMemory()
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Synchronously invokes the mechanism for keeping memory usage within the
cache size boundaries.
<p>This is an optional action for the application since this activity
is, by default, handled by a database environment owned background
thread.</p></div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
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<pre>public&nbsp;void&nbsp;compress()
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Synchronously invokes the compressor mechanism which compacts in memory
data structures after delete operations.
<p>This is an optional action for the application since this activity
is, by default, handled by a database environment owned background
thread.</p></div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
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<pre>public&nbsp;<a href="../../../com/sleepycat/je/PreloadStats.html" title="class in com.sleepycat.je">PreloadStats</a>&nbsp;preload(<a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a>[]&nbsp;databases,
<a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a>&nbsp;config)
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Preloads the cache with multiple databases. This method should only be
called when there are no operations being performed on the specified
databases in other threads. Executing preload during concurrent updates
of the specified databases may result in some or all of the tree being
loaded into the JE cache. Executing preload during any other types of
operations may result in JE exceeding its allocated cache
size. preload() effectively locks all of the specified database and
therefore will lock out the checkpointer, cleaner, and compressor, as
well as not allow eviction to occur. If databases are replicated and
the environment is in the replica state, then the replica may become
temporarily disconnected from the master if the replica needs to replay
changes against the database and is locked out because the time taken by
the preload operation exceeds <a href="../../../com/sleepycat/je/rep/ReplicationConfig.html#FEEDER_TIMEOUT"><code>ReplicationConfig.FEEDER_TIMEOUT</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>config</code> - The PreloadConfig object that specifies the parameters
of the preload.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A PreloadStats object with the result of the preload operation
and various statistics about the preload() operation.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
href="OperationFailureException.html#readFailures">Read Operation
Failures</a> occurs.</dd>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if any of the databases has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../com/sleepycat/je/Database.html#preload-com.sleepycat.je.PreloadConfig-"><code>Database.preload(PreloadConfig)</code></a></dd>
</dl>
</li>
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<pre>public&nbsp;<a href="../../../com/sleepycat/je/DiskOrderedCursor.html" title="class in com.sleepycat.je">DiskOrderedCursor</a>&nbsp;openDiskOrderedCursor(<a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a>[]&nbsp;databases,
<a href="../../../com/sleepycat/je/DiskOrderedCursorConfig.html" title="class in com.sleepycat.je">DiskOrderedCursorConfig</a>&nbsp;config)
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Create a DiskOrderedCursor to iterate over the records of a given set
of databases. Because the retrieval is based on Log Sequence Number
(LSN) order rather than key order, records are returned in unsorted
order in exchange for generally faster retrieval. LSN order
approximates disk sector order.
<p>
See <a href="../../../com/sleepycat/je/DiskOrderedCursor.html" title="class in com.sleepycat.je"><code>DiskOrderedCursor</code></a> for more details and a description of the
consistency guarantees provided by the scan.
<p>
<em>WARNING:</em> After calling this method, deletion of log files by
the JE log cleaner will be disabled until <a href="../../../com/sleepycat/je/DiskOrderedCursor.html#close--"><code>DiskOrderedCursor.close()</code></a> is called. To prevent unbounded growth of
disk usage, be sure to call <a href="../../../com/sleepycat/je/DiskOrderedCursor.html#close--"><code>DiskOrderedCursor.close()</code></a> to
re-enable log file deletion.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>databases</code> - An array containing the handles to the database that
are to be scanned. All these handles must be currently open.
Furthermore, all the databases must belong to this environments, and
they should all support duplicates or none of them should support
duplicates. Note: this method does not make a copy of this array,
and as a result, the contents of the array should not be modified
while the returned DiskOrderedCursor is still in use.</dd>
<dd><code>config</code> - The DiskOrderedCursorConfig object that specifies the
parameters of the disk ordered scan.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the new DiskOrderedCursor object.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if (a) the databases parameter is
null or an empty array, or (b) any of the handles in the databases
parameter is null, or (c) the databases do not all belong to this
environment, or (d) some databases support duplicates and some don't.</dd>
<dd><code>java.lang.IllegalStateException</code> - if any of the databases has been
closed or invalidated.</dd>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
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<h4>getConfig</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/EnvironmentConfig.html" title="class in com.sleepycat.je">EnvironmentConfig</a>&nbsp;getConfig()
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Returns this object's configuration.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>This object's configuration.
<p>Unlike most Environment methods, this method may be called if the
environment is invalid, but not yet closed.</p></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code> - if this handle has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
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<h4>setMutableConfig</h4>
<pre>public&nbsp;void&nbsp;setMutableConfig(<a href="../../../com/sleepycat/je/EnvironmentMutableConfig.html" title="class in com.sleepycat.je">EnvironmentMutableConfig</a>&nbsp;mutableConfig)
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Sets database environment attributes.
<p>Attributes only apply to a specific Environment object and are not
necessarily shared by other Environment objects accessing this
database environment.</p>
<p>Unlike most Environment methods, this method may be called if the
environment is invalid, but not yet closed.</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>mutableConfig</code> - The database environment attributes. If null,
default attributes are used.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
</ul>
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<h4>getMutableConfig</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/EnvironmentMutableConfig.html" title="class in com.sleepycat.je">EnvironmentMutableConfig</a>&nbsp;getMutableConfig()
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Returns database environment attributes.
<p>Unlike most Environment methods, this method may be called if the
environment is invalid, but not yet closed.</p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Environment attributes.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code> - if this handle has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
</ul>
<a name="getStats-com.sleepycat.je.StatsConfig-">
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<h4>getStats</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/EnvironmentStats.html" title="class in com.sleepycat.je">EnvironmentStats</a>&nbsp;getStats(<a href="../../../com/sleepycat/je/StatsConfig.html" title="class in com.sleepycat.je">StatsConfig</a>&nbsp;config)
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Returns the general database environment statistics.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>config</code> - The general statistics attributes. If null, default
attributes are used.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The general database environment statistics.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
</ul>
<a name="getLockStats-com.sleepycat.je.StatsConfig-">
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<h4>getLockStats</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/LockStats.html" title="class in com.sleepycat.je">LockStats</a>&nbsp;getLockStats(<a href="../../../com/sleepycat/je/StatsConfig.html" title="class in com.sleepycat.je">StatsConfig</a>&nbsp;config)
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">as of 4.0.10, replaced by <a href="../../../com/sleepycat/je/Environment.html#getStats-com.sleepycat.je.StatsConfig-"><code>getStats(StatsConfig)</code></a>.</p></span></div>
<div class="block">Returns the database environment's locking statistics.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>config</code> - The locking statistics attributes. If null, default
attributes are used.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The database environment's locking statistics.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
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<h4>getTransactionStats</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/TransactionStats.html" title="class in com.sleepycat.je">TransactionStats</a>&nbsp;getTransactionStats(<a href="../../../com/sleepycat/je/StatsConfig.html" title="class in com.sleepycat.je">StatsConfig</a>&nbsp;config)
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Returns the database environment's transactional statistics.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>config</code> - The transactional statistics attributes. If null,
default attributes are used.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The database environment's transactional statistics.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
</ul>
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<h4>getDatabaseNames</h4>
<pre>public&nbsp;java.util.List&lt;java.lang.String&gt;&nbsp;getDatabaseNames()
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Returns a List of database names for the database environment.
<p>Each element in the list is a String.</p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A List of database names for the database environment.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
href="OperationFailureException.html#readFailures">Read Operation
Failures</a> occurs.</dd>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
</ul>
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<h4>verify</h4>
<pre>public&nbsp;boolean&nbsp;verify(<a href="../../../com/sleepycat/je/VerifyConfig.html" title="class in com.sleepycat.je">VerifyConfig</a>&nbsp;config,
java.io.PrintStream&nbsp;out)
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Returns if the database environment is consistent and correct.
<p>Verification is an expensive operation that should normally only be
used for troubleshooting and debugging.</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>config</code> - The verification attributes. If null, default
attributes are used.</dd>
<dd><code>out</code> - is unused. To specify the output stream for verification
information, use <a href="../../../com/sleepycat/je/VerifyConfig.html#setShowProgressStream-java.io.PrintStream-"><code>VerifyConfig.setShowProgressStream(java.io.PrintStream)</code></a>.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the database environment is consistent and correct.
Currently true is always returned when this method returns normally,
i.e., when no exception is thrown.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if a corruption is detected, or if
an unexpected, internal or environment-wide failure occurs. If a
persistent corruption is detected,
<a href="../../../com/sleepycat/je/EnvironmentFailureException.html#isCorrupted--"><code>EnvironmentFailureException.isCorrupted()</code></a> will return true.</dd>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
</ul>
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<h4>getThreadTransaction</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;getThreadTransaction()
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Returns the transaction associated with this thread if implied
transactions are being used. Implied transactions are used in an XA or
JCA "Local Transaction" environment. In an XA environment the
XAEnvironment.start() entrypoint causes a transaction to be created and
become associated with the calling thread. Subsequent API calls
implicitly use that transaction. XAEnvironment.end() causes the
transaction to be disassociated with the thread. In a JCA Local
Transaction environment, the call to JEConnectionFactory.getConnection()
causes a new transaction to be created and associated with the calling
thread.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
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<h4>setThreadTransaction</h4>
<pre>public&nbsp;void&nbsp;setThreadTransaction(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a>&nbsp;txn)</pre>
<div class="block">Sets the transaction associated with this thread if implied transactions
are being used. Implied transactions are used in an XA or JCA "Local
Transaction" environment. In an XA environment the
XAEnvironment.start() entrypoint causes a transaction to be created and
become associated with the calling thread. Subsequent API calls
implicitly use that transaction. XAEnvironment.end() causes the
transaction to be disassociated with the thread. In a JCA Local
Transaction environment, the call to JEConnectionFactory.getConnection()
causes a new transaction to be created and associated with the calling
thread.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
</dl>
</li>
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<h4>isValid</h4>
<pre>public&nbsp;boolean&nbsp;isValid()</pre>
<div class="block">Returns whether this <code>Environment</code> is open, valid and can be used.
<p>When an <a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je"><code>EnvironmentFailureException</code></a>, or one of its
subclasses, is caught, the <code>isValid</code> method can be called to
determine whether the <code>Environment</code> can continue to be used, or
should be closed. Some EnvironmentFailureExceptions invalidate the
environment and others do not.</p>
<p>If this method returns false, the environment may have been closed by
the application, or may have been invalidated by an exception and not
yet closed. The <a href="../../../com/sleepycat/je/Environment.html#isClosed--"><code>isClosed()</code></a> method may be used to distinguish
between these two cases, and <a href="../../../com/sleepycat/je/Environment.html#getInvalidatingException--"><code>getInvalidatingException()</code></a> can be
used to return the exception. Note that it is safe to call <a href="../../../com/sleepycat/je/Environment.html#close--"><code>close()</code></a> redundantly, so it is safe to always call <a href="../../../com/sleepycat/je/Environment.html#close--"><code>close()</code></a> when
this method returns false.</p></div>
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<h4>isClosed</h4>
<pre>public&nbsp;boolean&nbsp;isClosed()</pre>
<div class="block">Returns whether the environment has been closed by the application.
<p>If this method returns true, <a href="../../../com/sleepycat/je/Environment.html#close--"><code>close()</code></a>} has been called. If
the environment was previously invalidated by an exception, it will be
returned by <a href="../../../com/sleepycat/je/Environment.html#getInvalidatingException--"><code>getInvalidatingException()</code></a>.</p>
<p>If this method returns false, the environment may or may not be
usable, since it may have been invalidated by an exception but not yet
closed. To determine whether it was invalidated, call <a href="../../../com/sleepycat/je/Environment.html#isValid--"><code>isValid()</code></a>
or <a href="../../../com/sleepycat/je/Environment.html#getInvalidatingException--"><code>getInvalidatingException()</code></a>.</p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether the environment has been closed by the application.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>7.2</dd>
</dl>
</li>
</ul>
<a name="getInvalidatingException--">
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<h4>getInvalidatingException</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a>&nbsp;getInvalidatingException()</pre>
<div class="block">Returns the exception that caused the environment to be invalidated, or
null if the environment was not invalidated by an exception.
<p>This method may be used to determine whether the environment was
invalidated by an exception, by checking for a non-null return value.
This method will return the invalidating exception, regardless of
whether the environment is closed. Note that <a href="../../../com/sleepycat/je/Environment.html#isValid--"><code>isValid()</code></a> will
return false when the environment is closed, even when it was not
invalidated by an exception.</p>
<p>This method may also be used to identify and handle the original
invalidating exception, when more than one exception is thrown. When an
environment is first invalidated by an EnvironmentFailureException, the
exception is saved so that it can be returned by this method. Other
EnvironmentFailureExceptions may be thrown later as side effects of the
original problem, or possibly as separate problems. It is normally the
first invalidating exception that is most relevant.</p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the invalidating exception or null.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>7.2</dd>
</dl>
</li>
</ul>
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<h4>printStartupInfo</h4>
<pre>public&nbsp;void&nbsp;printStartupInfo(java.io.PrintStream&nbsp;out)</pre>
<div class="block">Print a detailed report about the costs of different phases of
environment startup. This report is by default logged to the je.info
file if startup takes longer than je.env.startupThreshold.
<p>Unlike most Environment methods, this method may be called if the
environment is invalid, but not yet closed.</p></div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code> - if this handle or the underlying
environment has been closed.</dd>
</dl>
</li>
</ul>
<a name="isInternalHandle--">
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<h4>isInternalHandle</h4>
<pre>protected&nbsp;boolean&nbsp;isInternalHandle()</pre>
</li>
</ul>
</li>
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</li>
</ul>
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