<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>DbEnv::get_memory_init()</title> <link rel="stylesheet" href="apiReference.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Berkeley DB C++ API Reference" /> <link rel="up" href="env.html" title="Chapter 5. The DbEnv Handle" /> <link rel="prev" href="envget_intermediate_dir_mode.html" title="DbEnv::get_intermediate_dir_mode()" /> <link rel="next" href="envget_memory_max.html" title="DbEnv::get_memory_max()" /> </head> <body> <div xmlns="" class="navheader"> <div class="libver"> <p>Library Version 11.2.5.3</p> </div> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">DbEnv::get_memory_init()</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="envget_intermediate_dir_mode.html">Prev</a> </td> <th width="60%" align="center">Chapter 5. The DbEnv Handle </th> <td width="20%" align="right"> <a accesskey="n" href="envget_memory_max.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="envget_memory_init"></a>DbEnv::get_memory_init()</h2> </div> </div> </div> <pre class="programlisting">#include <db_cxx.h> int DbEnv::get_memory_init(DB_MEM_CONFIG type, u_int32_t *countp);</pre> <p> The <code class="methodname">DbEnv::get_memory_init()</code> method returns the number of objects to allocate and initialize when an environment is created. The count is returned for a specific named structure. The count for each structure is set using the <a class="xref" href="envset_memory_init.html" title="DbEnv::set_memory_init()">DbEnv::set_memory_init()</a> method. </p> <p> The <code class="methodname">DbEnv::get_memory_init()</code> method may be called at any time during the life of the application. </p> <p> The <code class="methodname">DbEnv::get_memory_init()</code> <span> <span> method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success. </span> </span> </p> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp6874256"></a>Parameters</h3> </div> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="idp6873608"></a>type</h4> </div> </div> </div> <p> The <span class="bold"><strong>struct</strong></span> parameter identifies the structure for which you want an object count returned. It must be one of the following values: </p> <div class="itemizedlist"> <ul type="disc"> <li> <p> <code class="literal">DB_MEM_LOCK</code> </p> <p> Initialize locks. A thread uses this structure to lock a page (or record for the QUEUE access method) and hold it to the end of a transactions. </p> </li> <li> <p> <code class="literal">DB_MEM_LOCKOBJECT</code> </p> <p> Initialize lock objects. For each page (or record) which is locked in the system, a lock object will be allocated. </p> </li> <li> <p> <code class="literal">DB_MEM_LOCKER</code> </p> <p> Initialize lockers. Each thread which is active in a transactional environment will use a locker structure either for each transaction which is active, or for each non-transactional cursor that is active. </p> </li> <li> <p> <code class="literal">DB_MEM_LOGID</code> </p> <p> Initialize the log fileid structures. For each database handle which is opened for writing in a transactional environment, a log fileid structure is used. </p> </li> <li> <p> <code class="literal">DB_MEM_TRANSACTION</code> </p> <p> Initialize transaction structures. Each active transaction uses a transaction structure until it either commits or aborts. </p> </li> <li> <p> <code class="literal">DB_MEM_THREAD</code> </p> <p> Initialize thread identification structures. If thread tracking is enabled then each active thread will use a structure. Note that since a thread does not signal the BDB library that it will no longer be making calls, unused structures may accumulate until a cleanup is triggered either using a high water mark or by running <a class="xref" href="envfailchk.html" title="DbEnv::failchk()">DbEnv::failchk()</a>. </p> </li> </ul> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="idp6887960"></a>countp</h4> </div> </div> </div> <p> The <span class="bold"><strong>countp</strong></span> parameter references memory into which the object count for the specified structure is copied. </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp6877816"></a>Class</h3> </div> </div> </div> <p> <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> </p> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp6890248"></a>See Also</h3> </div> </div> </div> <p> <a class="xref" href="env.html#envlist" title="Database Environments and Related Methods">Database Environments and Related Methods</a> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="envget_intermediate_dir_mode.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="env.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="envget_memory_max.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">DbEnv::get_intermediate_dir_mode() </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> DbEnv::get_memory_max()</td> </tr> </table> </div> </body> </html>