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_MPOOLFILE->set_lsn_offset()</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="mempset_ftype.html" title="DB_MPOOLFILE->set_ftype()" /> 12 <link rel="next" href="mempset_maxsize.html" title="DB_MPOOLFILE->set_maxsize()" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">DB_MPOOLFILE->set_lsn_offset()</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="mempset_ftype.html">Prev</a> </td> 22 <th width="60%" align="center">Chapter 8. 23 The DB_MPOOLFILE Handle 24 </th> 25 <td width="20%" align="right"> <a accesskey="n" href="mempset_maxsize.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="mempset_lsn_offset"></a>DB_MPOOLFILE->set_lsn_offset()</h2> 35 </div> 36 </div> 37 </div> 38 <pre class="programlisting">#include <db.h> 39 40int 41DB_MPOOLFILE->set_lsn_offset(DB_MPOOLFILE *mpf, int32_t lsn_offset); </pre> 42 <p> 43 The <code class="methodname">DB_MPOOLFILE->set_lsn_offset()</code> method specifies the zero-based 44 byte offset of a log sequence number 45 (<a class="link" href="lsn.html" title="Chapter 7. The DB_LSN Handle">DB_LSN</a>) on the file's pages, for 46 the purposes of page-flushing as part of transaction checkpoint. (See 47 the <a class="xref" href="mempsync.html" title="DB_ENV->memp_sync()">DB_ENV->memp_sync()</a> 48 documentation for more information.) 49 </p> 50 <p> 51 The <code class="methodname">DB_MPOOLFILE->set_lsn_offset()</code> method configures a file in the 52 cache, not only operations performed using the specified 53 <a class="link" href="memp.html" title="Chapter 8. The DB_MPOOLFILE Handle">DB_MPOOLFILE</a> handle. 54 </p> 55 <p> 56 The <code class="methodname">DB_MPOOLFILE->set_lsn_offset()</code> method may not be called after the 57 <a class="xref" href="mempfopen.html" title="DB_MPOOLFILE->open()">DB_MPOOLFILE->open()</a> 58 method is called. If the file is already open in the cache when 59 <a class="xref" href="mempfopen.html" title="DB_MPOOLFILE->open()">DB_MPOOLFILE->open()</a> is 60 called, the information specified to <code class="methodname">DB_MPOOLFILE->set_lsn_offset()</code> 61 must be consistent with the existing file or an error will be returned. 62 </p> 63 <p> 64 The <code class="methodname">DB_MPOOLFILE->set_lsn_offset()</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="id1692168"></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="id1692606"></a>lsn_offset</h4> 84 </div> 85 </div> 86 </div> 87 <p> 88 The <span class="bold"><strong>lsn_offset</strong></span> parameter is the 89 zero-based byte offset of the log sequence number on the file's pages. 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="id1692169"></a>Class</h3> 98 </div> 99 </div> 100 </div> 101 <p> 102 <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>, <a class="link" href="memp.html" title="Chapter 8. The DB_MPOOLFILE Handle">DB_MPOOLFILE</a> 103 </p> 104 </div> 105 <div class="sect2" lang="en" xml:lang="en"> 106 <div class="titlepage"> 107 <div> 108 <div> 109 <h3 class="title"><a id="id1692752"></a>See Also</h3> 110 </div> 111 </div> 112 </div> 113 <p> 114 <a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a> 115 </p> 116 </div> 117 </div> 118 <div class="navfooter"> 119 <hr /> 120 <table width="100%" summary="Navigation footer"> 121 <tr> 122 <td width="40%" align="left"><a accesskey="p" href="mempset_ftype.html">Prev</a> </td> 123 <td width="20%" align="center"> 124 <a accesskey="u" href="memp.html">Up</a> 125 </td> 126 <td width="40%" align="right"> <a accesskey="n" href="mempset_maxsize.html">Next</a></td> 127 </tr> 128 <tr> 129 <td width="40%" align="left" valign="top">DB_MPOOLFILE->set_ftype() </td> 130 <td width="20%" align="center"> 131 <a accesskey="h" href="index.html">Home</a> 132 </td> 133 <td width="40%" align="right" valign="top"> DB_MPOOLFILE->set_maxsize()</td> 134 </tr> 135 </table> 136 </div> 137 </body> 138</html> 139