2011-09-13 17:44:24 +00:00
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<title>DbEnv::get_memory_init()</title>
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<p>Library Version 11.2.5.2</p>
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<table width="100%" summary="Navigation header">
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<th colspan="3" align="center">DbEnv::get_memory_init()</th>
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<td width="20%" align="left"><a accesskey="p" href="envget_intermediate_dir_mode.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 5.
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The DbEnv Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="envget_memory_max.html">Next</a></td>
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<div>
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<h2 class="title" style="clear: both"><a id="envget_memory_init"></a>DbEnv::get_memory_init()</h2>
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</div>
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</div>
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<pre class="programlisting">#include <db_cxx.h>
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int
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DbEnv::get_memory_init(DB_MEM_CONFIG struct, u_int32_t *countp);</pre>
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<p>
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The <code class="methodname">DbEnv::get_memory_init()</code> method returns
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the number of objects to allocate and initialize when an
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environment is created. The count is returned for a specific named
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structure. The count for each structure is set using the
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<a class="xref" href="envset_memory_init.html" title="DbEnv::set_memory_init()">DbEnv::set_memory_init()</a>
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method.
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</p>
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<p>
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The <code class="methodname">DbEnv::get_memory_init()</code> method may be
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called at any time during the life of the application.
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</p>
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<p>
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The <code class="methodname">DbEnv::get_memory_init()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</span>
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3596023"></a>Parameters</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3596012"></a>struct</h4>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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<p>
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The <span class="bold"><strong>struct</strong></span> parameter
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identifies the structure for which you want
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an object count returned. It must be one of the following
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values:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<code class="literal">DB_MEM_LOCK</code>
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</p>
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<p>
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Initialize locks. A thread uses this structure
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to lock a page (or record for the QUEUE access
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method) and hold it to the end of a transactions.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_MEM_LOCKOBJECT</code>
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</p>
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<p>
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Initialize lock objects. For each page (or record) which
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is locked in the system, a lock object will be allocated.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_MEM_LOCKER</code>
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</p>
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<p>
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Initialize lockers. Each thread which is active in a
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transactional environment will use a locker structure
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either for each transaction which is active, or for each
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non-transactional cursor that is active.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_MEM_LOGID</code>
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</p>
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<p>
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Initialize the log fileid structures. For each database handle
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which is opened for writing in a transactional environment,
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a log fileid structure is used.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_MEM_TRANSACTION</code>
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</p>
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<p>
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Initialize transaction structures. Each active
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transaction uses a transaction structure until it
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either commits or aborts.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_MEM_THREAD</code>
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</p>
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<p>
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Initialize thread identification structures. If thread
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tracking is enabled then each active thread will use a
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structure. Note that since a thread does not signal the
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BDB library that it will no longer be making calls, unused
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structures may accumulate until a cleanup is triggered either
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using a high water mark or by running
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<a class="xref" href="envfailchk.html" title="DbEnv::failchk()">DbEnv::failchk()</a>.
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</p>
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</li>
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</ul>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3596246"></a>countp</h4>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>countp</strong></span> parameter references
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memory into which object count for which the specified
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structure is copied.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3596081"></a>Class</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3596284"></a>See Also</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="env.html#envlist" title="Database Environments and Related Methods">Database Environments and Related Methods</a>
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</p>
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<td width="40%" align="right"> <a accesskey="n" href="envget_memory_max.html">Next</a></td>
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<td width="40%" align="left" valign="top">DbEnv::get_intermediate_dir_mode() </td>
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<a accesskey="h" href="index.html">Home</a>
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<td width="40%" align="right" valign="top"> DbEnv::get_memory_max()</td>
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