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

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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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<h2 title="Class PreloadConfig" class="title">Class PreloadConfig</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>com.sleepycat.je.PreloadConfig</li>
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<pre>public class <span class="typeNameLabel">PreloadConfig</span>
extends java.lang.Object
implements java.lang.Cloneable</pre>
<div class="block">Specifies the attributes of an application invoked preload operation.</div>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.Phases.html" title="enum in com.sleepycat.je">PreloadConfig.Phases</a></span></code>
<div class="block">Preload progress listeners report this phase value, along with a
count of the number if times that the preload has fetched from disk.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#PreloadConfig--">PreloadConfig</a></span>()</code>
<div class="block">Default configuration used if null is passed to <a href="../../../com/sleepycat/je/Database.html#preload-long-"><code>Database.preload</code></a>.</div>
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<td class="colFirst"><code><a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#clone--">clone</a></span>()</code>
<div class="block">Returns a copy of this configuration object.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#getInternalMemoryLimit--">getInternalMemoryLimit</a></span>()</code>
<div class="block">Returns the maximum amount of non JE Cache Memory that preload can use at
one time.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#getLoadLNs--">getLoadLNs</a></span>()</code>
<div class="block">Return the configuration of the preload load LNs option.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#getLSNBatchSize--">getLSNBatchSize</a></span>()</code>
<div class="block">Preload is implemented to optimize I/O cost by fetching the records of
a Database by disk order, so that disk access is are sequential rather
than random.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#getMaxBytes--">getMaxBytes</a></span>()</code>
<div class="block">Return the number of bytes in the cache to stop the preload at.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#getMaxMillisecs--">getMaxMillisecs</a></span>()</code>
<div class="block">Return the number of millisecs to stop the preload after.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/ProgressListener.html" title="interface in com.sleepycat.je">ProgressListener</a>&lt;<a href="../../../com/sleepycat/je/PreloadConfig.Phases.html" title="enum in com.sleepycat.je">PreloadConfig.Phases</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#getProgressListener--">getProgressListener</a></span>()</code>
<div class="block">Return the ProgressListener for this PreloadConfig.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#setInternalMemoryLimit-long-">setInternalMemoryLimit</a></span>(long&nbsp;internalMemoryLimit)</code>
<div class="block">Set the maximum amount of non JE Cache Memory that preload can use at
one time.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#setLoadLNs-boolean-">setLoadLNs</a></span>(boolean&nbsp;loadLNs)</code>
<div class="block">Configure the preload load LNs option.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#setLSNBatchSize-long-">setLSNBatchSize</a></span>(long&nbsp;lsnBatchSize)</code>
<div class="block">Set the maximum number of LSNs to gather and sort at any one time.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#setMaxBytes-long-">setMaxBytes</a></span>(long&nbsp;maxBytes)</code>
<div class="block">Configure the maximum number of bytes to preload.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#setMaxMillisecs-long-">setMaxMillisecs</a></span>(long&nbsp;maxMillisecs)</code>
<div class="block">Configure the maximum number of milliseconds to execute preload.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#setProgressListener-com.sleepycat.je.ProgressListener-">setProgressListener</a></span>(<a href="../../../com/sleepycat/je/ProgressListener.html" title="interface in com.sleepycat.je">ProgressListener</a>&lt;<a href="../../../com/sleepycat/je/PreloadConfig.Phases.html" title="enum in com.sleepycat.je">PreloadConfig.Phases</a>&gt;&nbsp;progressListener)</code>
<div class="block">Configure the preload operation to make periodic calls to a <a href="../../../com/sleepycat/je/ProgressListener.html" title="interface in com.sleepycat.je"><code>ProgressListener</code></a> to provide feedback on preload progress.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/PreloadConfig.html#toString--">toString</a></span>()</code>
<div class="block">Returns the values for each configuration attribute.</div>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h3>Constructor Detail</h3>
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<h4>PreloadConfig</h4>
<pre>public&nbsp;PreloadConfig()</pre>
<div class="block">Default configuration used if null is passed to <a href="../../../com/sleepycat/je/Database.html#preload-long-"><code>Database.preload</code></a>.</div>
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<h4>setMaxBytes</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a>&nbsp;setMaxBytes(long&nbsp;maxBytes)</pre>
<div class="block">Configure the maximum number of bytes to preload.
<p>The default is 0 for this class.</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>maxBytes</code> - If the maxBytes parameter is non-zero, a preload will
stop when the cache contains this number of bytes.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>this</dd>
</dl>
</li>
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<a name="getMaxBytes--">
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<h4>getMaxBytes</h4>
<pre>public&nbsp;long&nbsp;getMaxBytes()</pre>
<div class="block">Return the number of bytes in the cache to stop the preload at.
<p>This method may be called at any time during the life of the
application.</p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The number of bytes in the cache to stop the preload at.</dd>
</dl>
</li>
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<a name="setMaxMillisecs-long-">
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<h4>setMaxMillisecs</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a>&nbsp;setMaxMillisecs(long&nbsp;maxMillisecs)</pre>
<div class="block">Configure the maximum number of milliseconds to execute preload.
<p>The default is 0 for this class.</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>maxMillisecs</code> - If the maxMillisecs parameter is non-zero, a preload
will stop when this amount of time has passed.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>this</dd>
</dl>
</li>
</ul>
<a name="getMaxMillisecs--">
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<h4>getMaxMillisecs</h4>
<pre>public&nbsp;long&nbsp;getMaxMillisecs()</pre>
<div class="block">Return the number of millisecs to stop the preload after.
<p>This method may be called at any time during the life of the
application.</p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The number of millisecs to stop the preload after.</dd>
</dl>
</li>
</ul>
<a name="setLoadLNs-boolean-">
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<h4>setLoadLNs</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a>&nbsp;setLoadLNs(boolean&nbsp;loadLNs)</pre>
<div class="block">Configure the preload load LNs option.
<p>The default is false for this class.</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>loadLNs</code> - If set to true, the preload will load Leaf Nodes (LNs)
containing the data values.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>this</dd>
</dl>
</li>
</ul>
<a name="getLoadLNs--">
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<h4>getLoadLNs</h4>
<pre>public&nbsp;boolean&nbsp;getLoadLNs()</pre>
<div class="block">Return the configuration of the preload load LNs option.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The configuration of the preload load LNs option.</dd>
</dl>
</li>
</ul>
<a name="setProgressListener-com.sleepycat.je.ProgressListener-">
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<h4>setProgressListener</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a>&nbsp;setProgressListener(<a href="../../../com/sleepycat/je/ProgressListener.html" title="interface in com.sleepycat.je">ProgressListener</a>&lt;<a href="../../../com/sleepycat/je/PreloadConfig.Phases.html" title="enum in com.sleepycat.je">PreloadConfig.Phases</a>&gt;&nbsp;progressListener)</pre>
<div class="block">Configure the preload operation to make periodic calls to a <a href="../../../com/sleepycat/je/ProgressListener.html" title="interface in com.sleepycat.je"><code>ProgressListener</code></a> to provide feedback on preload progress.
The ProgressListener.progress() method is called each time the preload
mush fetch a btree node or data record from disk.
<p>
When using progress listeners, review the information at <a href="../../../com/sleepycat/je/ProgressListener.html#progress-T-long-long-"><code>ProgressListener.progress(T, long, long)</code></a> to avoid any unintended disruption to
replication stream syncup.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>progressListener</code> - The ProgressListener to callback during
preload.</dd>
</dl>
</li>
</ul>
<a name="getProgressListener--">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>getProgressListener</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/ProgressListener.html" title="interface in com.sleepycat.je">ProgressListener</a>&lt;<a href="../../../com/sleepycat/je/PreloadConfig.Phases.html" title="enum in com.sleepycat.je">PreloadConfig.Phases</a>&gt;&nbsp;getProgressListener()</pre>
<div class="block">Return the ProgressListener for this PreloadConfig.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the ProgressListener for this PreloadConfig.</dd>
</dl>
</li>
</ul>
<a name="setLSNBatchSize-long-">
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<h4>setLSNBatchSize</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a>&nbsp;setLSNBatchSize(long&nbsp;lsnBatchSize)</pre>
<div class="block">Set the maximum number of LSNs to gather and sort at any one time. The
default is an unlimited number of LSNs. Setting this lower causes the
preload to use less memory, but it sorts and processes LSNs more
frequently thereby causing slower performance. Setting this higher will
in general improve performance at the expense of memory. Each LSN uses
16 bytes of memory.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>lsnBatchSize</code> - the maximum number of LSNs to accumulate and sort
per batch.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>this</dd>
</dl>
</li>
</ul>
<a name="getLSNBatchSize--">
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<h4>getLSNBatchSize</h4>
<pre>public&nbsp;long&nbsp;getLSNBatchSize()</pre>
<div class="block">Preload is implemented to optimize I/O cost by fetching the records of
a Database by disk order, so that disk access is are sequential rather
than random. LSNs (log sequence numbers) are the disk addresses of
database records. Setting this value causes the preload to process
batches of LSNs rather than all in-memory LSNs at one time,
which bounds the memory usage of
the preload processing, at the expense of preload performance.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the maximum number of LSNs to be sorted that this
preload is configured for.</dd>
</dl>
</li>
</ul>
<a name="setInternalMemoryLimit-long-">
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<h4>setInternalMemoryLimit</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a>&nbsp;setInternalMemoryLimit(long&nbsp;internalMemoryLimit)</pre>
<div class="block">Set the maximum amount of non JE Cache Memory that preload can use at
one time. The default is an unlimited amount of memory. Setting this
lower causes the preload to use less memory, but generally results in
slower performance. Setting this higher will often improve performance
at the expense of higher memory utilization.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>internalMemoryLimit</code> - the maximum number of non JE Cache bytes to
use.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>this</dd>
</dl>
</li>
</ul>
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<h4>getInternalMemoryLimit</h4>
<pre>public&nbsp;long&nbsp;getInternalMemoryLimit()</pre>
<div class="block">Returns the maximum amount of non JE Cache Memory that preload can use at
one time.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the maximum amount of non JE Cache Memory that preload can use at
one time.</dd>
</dl>
</li>
</ul>
<a name="clone--">
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<h4>clone</h4>
<pre>public&nbsp;<a href="../../../com/sleepycat/je/PreloadConfig.html" title="class in com.sleepycat.je">PreloadConfig</a>&nbsp;clone()</pre>
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<pre>public&nbsp;java.lang.String&nbsp;toString()</pre>
<div class="block">Returns the values for each configuration attribute.</div>
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