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->fileid_reset()</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="env.html" title="Chapter��5.�� The DB_ENV Handle" /> 11 <link rel="prev" href="envfailchk.html" title="DB_ENV->failchk()" /> 12 <link rel="next" href="envget_create_dir.html" title="DB_ENV->get_create_dir()" /> 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->fileid_reset()</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="envfailchk.html">Prev</a>��</td> 22 <th width="60%" align="center">Chapter��5.�� 23 The DB_ENV Handle 24 </th> 25 <td width="20%" align="right">��<a accesskey="n" href="envget_create_dir.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="envfileid_reset"></a>DB_ENV->fileid_reset()</h2> 35 </div> 36 </div> 37 </div> 38 <pre class="programlisting">#include <db.h> 39 40int 41DB_ENV->fileid_reset(DB_ENV *dbenv, const char *file, u_int32_t flags); </pre> 42 <p> 43 The <code class="methodname">DB_ENV->fileid_reset()</code> method allows database files to be copied, 44 and then the copy used in the same database environment as the 45 original. 46 </p> 47 <p> 48 All databases contain an ID string used to identify the database in 49 the database environment cache. If a physical database file is 50 copied, and used in the same environment as another file with the same 51 ID strings, corruption can occur. The <code class="methodname">DB_ENV->fileid_reset()</code> method 52 creates new ID strings for all of the databases in the physical file. 53 </p> 54 <p> 55 The <code class="methodname">DB_ENV->fileid_reset()</code> method modifies the physical file, 56 in-place. Applications should not reset IDs in files that are 57 currently in use. 58 </p> 59 <p> 60 The <code class="methodname">DB_ENV->fileid_reset()</code> method may be called at any time during 61 the life of the application. 62 </p> 63 <p> 64 The <code class="methodname">DB_ENV->fileid_reset()</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="id1662597"></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="id1662486"></a>file</h4> 84 </div> 85 </div> 86 </div> 87 <p> 88 The name of the physical file in which new file IDs are to be created. 89 </p> 90 </div> 91 <div class="sect3" lang="en" xml:lang="en"> 92 <div class="titlepage"> 93 <div> 94 <div> 95 <h4 class="title"><a id="id1662701"></a>flags</h4> 96 </div> 97 </div> 98 </div> 99 <p> 100 The <span class="bold"><strong>flags</strong></span> parameter must be set to 0 101 or the following value: 102 </p> 103 <div class="itemizedlist"> 104 <ul type="disc"> 105 <li> 106 <p> 107 <code class="literal">DB_ENCRYPT</code> 108 </p> 109 <p> 110 The file contains encrypted databases. 111 </p> 112 </li> 113 </ul> 114 </div> 115 </div> 116 </div> 117 <div class="sect2" lang="en" xml:lang="en"> 118 <div class="titlepage"> 119 <div> 120 <div> 121 <h3 class="title"><a id="id1662778"></a>Errors</h3> 122 </div> 123 </div> 124 </div> 125 <p> 126 The <code class="methodname">DB_ENV->fileid_reset()</code> <span> 127 <span> 128 method may fail and return one of the following non-zero errors: 129 </span> 130 131 </span> 132 </p> 133 <div class="sect3" lang="en" xml:lang="en"> 134 <div class="titlepage"> 135 <div> 136 <div> 137 <h4 class="title"><a id="id1662793"></a>EINVAL</h4> 138 </div> 139 </div> 140 </div> 141 <p> 142 An invalid flag value or parameter was specified. 143 </p> 144 </div> 145 </div> 146 <div class="sect2" lang="en" xml:lang="en"> 147 <div class="titlepage"> 148 <div> 149 <div> 150 <h3 class="title"><a id="id1662780"></a>Class</h3> 151 </div> 152 </div> 153 </div> 154 <p> 155 <a class="link" href="env.html" title="Chapter��5.�� The DB_ENV Handle">DB_ENV</a> 156 </p> 157 </div> 158 <div class="sect2" lang="en" xml:lang="en"> 159 <div class="titlepage"> 160 <div> 161 <div> 162 <h3 class="title"><a id="id1662791"></a>See Also</h3> 163 </div> 164 </div> 165 </div> 166 <p> 167 <a class="xref" href="env.html#envlist" title="Database Environments and Related Methods">Database Environments and Related Methods</a> 168 </p> 169 </div> 170 </div> 171 <div class="navfooter"> 172 <hr /> 173 <table width="100%" summary="Navigation footer"> 174 <tr> 175 <td width="40%" align="left"><a accesskey="p" href="envfailchk.html">Prev</a>��</td> 176 <td width="20%" align="center"> 177 <a accesskey="u" href="env.html">Up</a> 178 </td> 179 <td width="40%" align="right">��<a accesskey="n" href="envget_create_dir.html">Next</a></td> 180 </tr> 181 <tr> 182 <td width="40%" align="left" valign="top">DB_ENV->failchk()��</td> 183 <td width="20%" align="center"> 184 <a accesskey="h" href="index.html">Home</a> 185 </td> 186 <td width="40%" align="right" valign="top">��DB_ENV->get_create_dir()</td> 187 </tr> 188 </table> 189 </div> 190 </body> 191</html> 192