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->set_tx_timestamp()</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="txn.html" title="Chapter 12. The DB_TXN Handle" /> 11 <link rel="prev" href="envset_tx_max.html" title="DB_ENV->set_tx_max()" /> 12 <link rel="next" href="txnabort.html" title="DB_TXN->abort()" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">DB_ENV->set_tx_timestamp()</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="envset_tx_max.html">Prev</a> </td> 22 <th width="60%" align="center">Chapter 12. 23 The DB_TXN Handle 24 </th> 25 <td width="20%" align="right"> <a accesskey="n" href="txnabort.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="envset_tx_timestamp"></a>DB_ENV->set_tx_timestamp()</h2> 35 </div> 36 </div> 37 </div> 38 <pre class="programlisting">#include <db.h> 39 40int 41DB_ENV->set_tx_timestamp(DB_ENV *dbenv, time_t *timestamp); </pre> 42 <p> 43 Recover to the time specified by <span class="bold"><strong>timestamp</strong></span> rather than to the most current 44 possible date. 45 </p> 46 <p> 47 Once a database environment has been upgraded to a new version of 48 Berkeley DB involving a log format change (see <a href="../../programmer_reference/upgrade_process.html" class="olink">Upgrading Berkeley DB installations</a>), it is no longer possible to recover to a 49 specific time before that upgrade. 50 </p> 51 <p> 52 The <code class="methodname">DB_ENV->set_tx_timestamp()</code> method configures operations performed 53 using the specified <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a> handle, not all 54 operations performed on the underlying database environment. 55 </p> 56 <p> 57 The <code class="methodname">DB_ENV->set_tx_timestamp()</code> method may not be called after the 58 <a class="xref" href="envopen.html" title="DB_ENV->open()">DB_ENV->open()</a> method is 59 called. 60 </p> 61 <p> 62 The <code class="methodname">DB_ENV->set_tx_timestamp()</code> <span> 63 <span> 64 method returns a non-zero error value on failure and 0 on success. 65 </span> 66 67 </span> 68 </p> 69 <div class="sect2" lang="en" xml:lang="en"> 70 <div class="titlepage"> 71 <div> 72 <div> 73 <h3 class="title"><a id="id1707989"></a>Parameters</h3> 74 </div> 75 </div> 76 </div> 77 <div class="sect3" lang="en" xml:lang="en"> 78 <div class="titlepage"> 79 <div> 80 <div> 81 <h4 class="title"><a id="id1708103"></a>timestamp</h4> 82 </div> 83 </div> 84 </div> 85 <p> 86 The <span class="bold"><strong>timestamp</strong></span> parameter references 87 the memory location where the recovery timestamp is located. 88 </p> 89 <p> 90 The <span class="bold"><strong>timestamp</strong></span> parameter should be the 91 number of seconds since 0 hours, 0 minutes, 0 seconds, January 1, 92 1970, Coordinated Universal Time; that is, the Epoch. 93 </p> 94 </div> 95 </div> 96 <div class="sect2" lang="en" xml:lang="en"> 97 <div class="titlepage"> 98 <div> 99 <div> 100 <h3 class="title"><a id="id1708260"></a>Errors</h3> 101 </div> 102 </div> 103 </div> 104 <p> 105 The <code class="methodname">DB_ENV->set_tx_timestamp()</code> <span> 106 <span> 107 method may fail and return one of the following non-zero errors: 108 </span> 109 110 </span> 111 </p> 112 <div class="sect3" lang="en" xml:lang="en"> 113 <div class="titlepage"> 114 <div> 115 <div> 116 <h4 class="title"><a id="id1707705"></a>EINVAL</h4> 117 </div> 118 </div> 119 </div> 120 <p> 121 If it is not possible to recover to the specified time using the log 122 files currently present in the environment; or if an invalid flag 123 value or parameter was specified. 124 </p> 125 </div> 126 </div> 127 <div class="sect2" lang="en" xml:lang="en"> 128 <div class="titlepage"> 129 <div> 130 <div> 131 <h3 class="title"><a id="id1708163"></a>Class</h3> 132 </div> 133 </div> 134 </div> 135 <p> 136 <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>, 137 <a class="link" href="txn.html" title="Chapter 12. The DB_TXN Handle">DB_TXN</a> 138 </p> 139 </div> 140 <div class="sect2" lang="en" xml:lang="en"> 141 <div class="titlepage"> 142 <div> 143 <div> 144 <h3 class="title"><a id="id1707990"></a>See Also</h3> 145 </div> 146 </div> 147 </div> 148 <p> 149 <a class="xref" href="txn.html#txnlist" title="Transaction Subsystem and Related Methods">Transaction Subsystem and Related Methods</a> 150 </p> 151 </div> 152 </div> 153 <div class="navfooter"> 154 <hr /> 155 <table width="100%" summary="Navigation footer"> 156 <tr> 157 <td width="40%" align="left"><a accesskey="p" href="envset_tx_max.html">Prev</a> </td> 158 <td width="20%" align="center"> 159 <a accesskey="u" href="txn.html">Up</a> 160 </td> 161 <td width="40%" align="right"> <a accesskey="n" href="txnabort.html">Next</a></td> 162 </tr> 163 <tr> 164 <td width="40%" align="left" valign="top">DB_ENV->set_tx_max() </td> 165 <td width="20%" align="center"> 166 <a accesskey="h" href="index.html">Home</a> 167 </td> 168 <td width="40%" align="right" valign="top"> DB_TXN->abort()</td> 169 </tr> 170 </table> 171 </div> 172 </body> 173</html> 174