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->set_q_extentsize()</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="db.html" title="Chapter��2.�� The DB Handle" /> 11 <link rel="prev" href="dbset_priority.html" title="DB->set_priority()" /> 12 <link rel="next" href="dbset_re_delim.html" title="DB->set_re_delim()" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">DB->set_q_extentsize()</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="dbset_priority.html">Prev</a>��</td> 22 <th width="60%" align="center">Chapter��2.�� 23 The DB Handle 24 </th> 25 <td width="20%" align="right">��<a accesskey="n" href="dbset_re_delim.html">Next</a></td> 26 </tr> 27 </table> 28 <hr /> 29 </div> 30 <div class="sect1" lang="en" xml:lang="en"> 31 <div class="titlepage"> 32 <div> 33 <div> 34 <h2 class="title" style="clear: both"><a id="dbset_q_extentsize"></a>DB->set_q_extentsize()</h2> 35 </div> 36 </div> 37 </div> 38 <pre class="programlisting">#include <db.h> 39 40int 41DB->set_q_extentsize(DB *db, u_int32_t extentsize); </pre> 42 <p> 43 Set the size of the extents used to hold pages in a Queue database, 44 specified as a number of pages. Each extent is created as a separate 45 physical file. If no extent size is set, the default behavior is to 46 create only a single underlying database file. 47 </p> 48 <p> 49 For information on tuning the extent size, see <a href="../../programmer_reference/rq_conf.html#am_conf_extentsize" class="olink">Selecting a extent size</a>. 50 </p> 51 <p> 52 The <code class="methodname">DB->set_q_extentsize()</code> method configures a database, not only 53 operations performed using the specified <a class="link" href="db.html" title="Chapter��2.�� The DB Handle">DB</a> 54 handle. 55 </p> 56 <p> 57 The <code class="methodname">DB->set_q_extentsize()</code> method may not be called after the 58 <a class="xref" href="dbopen.html" title="DB->open()">DB->open()</a> method is called. If 59 the database already exists when 60 <a class="xref" href="dbopen.html" title="DB->open()">DB->open()</a> is called, the 61 information specified to <code class="methodname">DB->set_q_extentsize()</code> will be ignored. 62 </p> 63 <p> 64 The <code class="methodname">DB->set_q_extentsize()</code> <span> 65 <span> 66 method returns a non-zero error value on failure and 0 on success. 67 </span> 68 69 </span> 70 </p> 71 <div class="sect2" lang="en" xml:lang="en"> 72 <div class="titlepage"> 73 <div> 74 <div> 75 <h3 class="title"><a id="id1649496"></a>Parameters</h3> 76 </div> 77 </div> 78 </div> 79 <div class="sect3" lang="en" xml:lang="en"> 80 <div class="titlepage"> 81 <div> 82 <div> 83 <h4 class="title"><a id="id1649466"></a>extentsize</h4> 84 </div> 85 </div> 86 </div> 87 <p> 88 The <span class="bold"><strong>extentsize</strong></span> parameter is the 89 number of pages in a Queue database extent. 90 </p> 91 </div> 92 </div> 93 <div class="sect2" lang="en" xml:lang="en"> 94 <div class="titlepage"> 95 <div> 96 <div> 97 <h3 class="title"><a id="id1649761"></a>Errors</h3> 98 </div> 99 </div> 100 </div> 101 <p> 102 The <code class="methodname">DB->set_q_extentsize()</code> <span> 103 <span> 104 method may fail and return one of the following non-zero errors: 105 </span> 106 107 </span> 108 </p> 109 <div class="sect3" lang="en" xml:lang="en"> 110 <div class="titlepage"> 111 <div> 112 <div> 113 <h4 class="title"><a id="id1649479"></a>EINVAL</h4> 114 </div> 115 </div> 116 </div> 117 <p> 118 If the method was called after <a class="xref" href="dbopen.html" title="DB->open()">DB->open()</a> 119 was called; or if an invalid flag value or parameter was specified. 120 </p> 121 </div> 122 </div> 123 <div class="sect2" lang="en" xml:lang="en"> 124 <div class="titlepage"> 125 <div> 126 <div> 127 <h3 class="title"><a id="id1649306"></a>Class</h3> 128 </div> 129 </div> 130 </div> 131 <p> 132 <a class="link" href="db.html" title="Chapter��2.�� The DB Handle">DB</a> 133 </p> 134 </div> 135 <div class="sect2" lang="en" xml:lang="en"> 136 <div class="titlepage"> 137 <div> 138 <div> 139 <h3 class="title"><a id="id1649469"></a>See Also</h3> 140 </div> 141 </div> 142 </div> 143 <p> 144 <a class="xref" href="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a> 145 </p> 146 </div> 147 </div> 148 <div class="navfooter"> 149 <hr /> 150 <table width="100%" summary="Navigation footer"> 151 <tr> 152 <td width="40%" align="left"><a accesskey="p" href="dbset_priority.html">Prev</a>��</td> 153 <td width="20%" align="center"> 154 <a accesskey="u" href="db.html">Up</a> 155 </td> 156 <td width="40%" align="right">��<a accesskey="n" href="dbset_re_delim.html">Next</a></td> 157 </tr> 158 <tr> 159 <td width="40%" align="left" valign="top">DB->set_priority()��</td> 160 <td width="20%" align="center"> 161 <a accesskey="h" href="index.html">Home</a> 162 </td> 163 <td width="40%" align="right" valign="top">��DB->set_re_delim()</td> 164 </tr> 165 </table> 166 </div> 167 </body> 168</html> 169