docs/api_reference/C/envset_mp_tablesize.html

   1 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
   2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
   3 <html xmlns="http://www.w3.org/1999/xhtml">
   4   <head>
   5     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
   6     <title>DB_ENV-&gt;set_mp_tablesize()</title>
   7     <link rel="stylesheet" href="apiReference.css" type="text/css" />
   8     <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
   9     <link rel="start" href="index.html" title="Berkeley DB C API Reference" />
  10     <link rel="up" href="memp.html" title="Chapter 8.  The DB_MPOOLFILE Handle" />
  11     <link rel="prev" href="envset_mp_pagesize.html" title="DB_ENV-&gt;set_mp_pagesize()" />
  12     <link rel="next" href="mempfclose.html" title="DB_MPOOLFILE-&gt;close()" />
  13   </head>
  14   <body>
  15     <div xmlns="" class="navheader">
  16       <div class="libver">
  17         <p>Library Version 11.2.5.3</p>
  18       </div>
  19       <table width="100%" summary="Navigation header">
  20         <tr>
  21           <th colspan="3" align="center">DB_ENV-&gt;set_mp_tablesize()</th>
  22         </tr>
  23         <tr>
  24           <td width="20%" align="left"><a accesskey="p" href="envset_mp_pagesize.html">Prev</a> </td>
  25           <th width="60%" align="center">Chapter 8.
  26               The  DB_MPOOLFILE Handle
  27         </th>
  28           <td width="20%" align="right"> <a accesskey="n" href="mempfclose.html">Next</a></td>
  29         </tr>
  30       </table>
  31       <hr />
  32     </div>
  33     <div class="sect1" lang="en" xml:lang="en">
  34       <div class="titlepage">
  35         <div>
  36           <div>
  37             <h2 class="title" style="clear: both"><a id="envset_mp_tablesize"></a>DB_ENV-&gt;set_mp_tablesize()</h2>
  38           </div>
  39         </div>
  40       </div>
  41       <pre class="programlisting">#include &lt;db.h&gt;
  42
  43 int
  44 DB_ENV-&gt;set_mp_tablesize(DB_ENV *dbenv, u_int32_t tablesize);  </pre>
  45       <p>
  46          The <code class="methodname">DB_ENV-&gt;set_mp_tablesize()</code> method
  47          overrides the calculated hash table size. This value is then internally
  48          adjusted to a nearby prime number in order to enhance the hashing algorithm.
  49     </p>
  50       <p>
  51          This method may be called only before the environment is opened.
  52     </p>
  53       <div class="sect2" lang="en" xml:lang="en">
  54         <div class="titlepage">
  55           <div>
  56             <div>
  57               <h3 class="title"><a id="idp61362568"></a>Parameters</h3>
  58             </div>
  59           </div>
  60         </div>
  61         <div class="sect3" lang="en" xml:lang="en">
  62           <div class="titlepage">
  63             <div>
  64               <div>
  65                 <h4 class="title"><a id="idp61362760"></a>tablesize</h4>
  66               </div>
  67             </div>
  68           </div>
  69           <p>
  70                           The table size parameter specifies the size of the
  71                           buffer pool hash table. It is adjusted to a near
  72                           prime number to enhance the hashing algorithm.
  73                      </p>
  74         </div>
  75       </div>
  76       <div class="sect2" lang="en" xml:lang="en">
  77         <div class="titlepage">
  78           <div>
  79             <div>
  80               <h3 class="title"><a id="idp61368600"></a>Class</h3>
  81             </div>
  82           </div>
  83         </div>
  84         <p>
  85                     <a class="link" href="env.html" title="Chapter 5.  The DB_ENV Handle">DB_ENV</a>,
  86                     <a class="link" href="memp.html" title="Chapter 8.  The DB_MPOOLFILE Handle">DB_MPOOLFILE</a>
  87             </p>
  88       </div>
  89       <div class="sect2" lang="en" xml:lang="en">
  90         <div class="titlepage">
  91           <div>
  92             <div>
  93               <h3 class="title"><a id="idp61369680"></a>See Also</h3>
  94             </div>
  95           </div>
  96         </div>
  97         <p>
  98                         <a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a>,
  99                         <a class="xref" href="envget_mp_tablesize.html" title="DB_ENV-&gt;get_mp_tablesize()">DB_ENV-&gt;get_mp_tablesize()</a>
 100                 </p>
 101       </div>
 102     </div>
 103     <div class="navfooter">
 104       <hr />
 105       <table width="100%" summary="Navigation footer">
 106         <tr>
 107           <td width="40%" align="left"><a accesskey="p" href="envset_mp_pagesize.html">Prev</a> </td>
 108           <td width="20%" align="center">
 109             <a accesskey="u" href="memp.html">Up</a>
 110           </td>
 111           <td width="40%" align="right"> <a accesskey="n" href="mempfclose.html">Next</a></td>
 112         </tr>
 113         <tr>
 114           <td width="40%" align="left" valign="top">DB_ENV-&gt;set_mp_pagesize() </td>
 115           <td width="20%" align="center">
 116             <a accesskey="h" href="index.html">Home</a>
 117           </td>
 118           <td width="40%" align="right" valign="top"> DB_MPOOLFILE-&gt;close()</td>
 119         </tr>
 120       </table>
 121     </div>
 122   </body>
 123 </html>