mirror of
https://github.com/yasuhirokimura/db18
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Yasuhiro KIMURA
132 lines
5.7 KiB
HTML
132 lines
5.7 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Chapter 24. Dumping and Reloading Databases</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
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<link rel="up" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
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<link rel="prev" href="ext_php.html" title="Using Berkeley DB with PHP" />
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<link rel="next" href="dumpload_format.html" title="Dump output formats" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 18.1.40</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Chapter 24. Dumping and Reloading Databases
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</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="ext_php.html">Prev</a> </td>
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<th width="60%" align="center"> </th>
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<td width="20%" align="right"> <a accesskey="n" href="dumpload_format.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="chapter" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title"><a id="dumpload"></a>Chapter 24. Dumping and Reloading Databases
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</h2>
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</div>
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</div>
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</div>
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<div class="toc">
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<p>
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<b>Table of Contents</b>
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</p>
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<dl>
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<dt>
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<span class="sect1">
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<a href="dumpload.html#dumpload_utility">The db_dump and db_load utilities</a>
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</span>
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</dt>
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<dt>
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<span class="sect1">
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<a href="dumpload_format.html">Dump output formats</a>
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</span>
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</dt>
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<dt>
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<span class="sect1">
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<a href="dumpload_text.html">Loading text into databases</a>
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</span>
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</dt>
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</dl>
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="dumpload_utility"></a>The db_dump and db_load utilities</h2>
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</div>
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</div>
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</div>
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<p>
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There are three utilities used for dumping and loading
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Berkeley DB databases: the <a href="../api_reference/C/db_dump.html" class="olink">db_dump</a> utility, the <a href="../api_reference/C/db_dump.html" class="olink">db_dump185</a> utility and the
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<a href="../api_reference/C/db_load.html" class="olink">db_load</a> utility.
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</p>
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<p>
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The <a href="../api_reference/C/db_dump.html" class="olink">db_dump</a> utility and the <a href="../api_reference/C/db_dump.html" class="olink">db_dump185</a> utility dump Berkeley DB
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databases into a flat-text representation of the data that can
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be read by <a href="../api_reference/C/db_load.html" class="olink">db_load</a> utility. The only difference between them is that
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the <a href="../api_reference/C/db_dump.html" class="olink">db_dump</a> utility reads Berkeley DB version 2 and greater database
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formats, whereas the <a href="../api_reference/C/db_dump.html" class="olink">db_dump185</a> utility reads Berkeley DB version
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1.85 and 1.86 database formats.
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</p>
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<p>
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The <a href="../api_reference/C/db_load.html" class="olink">db_load</a> utility reads either the output format used by the
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dump utilities or (optionally) a flat-text representation
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created using other tools, and stores it into a Berkeley DB
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database.
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</p>
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<p>
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Dumping and reloading Hash databases that use user-defined
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hash functions will result in new databases that use the
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default hash function. Although using the default hash
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function may not be optimal for the new database, it will
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continue to work correctly.
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</p>
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<p>
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Dumping and reloading Btree databases that use user-defined
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prefix or comparison functions will result in new databases
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that use the default prefix and comparison functions. In this
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case, it is quite likely that applications will be unable to
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retrieve records, and it is possible that the load process
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itself will fail.
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</p>
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<p>
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The only available workaround for either Hash or Btree
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databases is to modify the sources for the <a href="../api_reference/C/db_load.html" class="olink">db_load</a> utility to load
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the database using the correct hash, prefix, and comparison
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functions.
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</p>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="ext_php.html">Prev</a> </td>
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<td width="20%" align="center"> </td>
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<td width="40%" align="right"> <a accesskey="n" href="dumpload_format.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Using Berkeley DB with PHP </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Dump output formats</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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