mirror of
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Yasuhiro KIMURA
209 lines
7.3 KiB
HTML
209 lines
7.3 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 4. Access Method Wrapup</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="am_cursor.html" title="Cursor operations" />
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<link rel="next" href="am_misc_bulk.html" title="Retrieving and updating records in bulk" />
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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 4. Access Method Wrapup </th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="am_cursor.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="am_misc_bulk.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="am_misc"></a>Chapter 4. Access Method Wrapup </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="am_misc.html#am_misc_align">Data alignment</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="am_misc_bulk.html">Retrieving and updating records in bulk</a>
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</span>
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</dt>
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<dd>
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<dl>
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<dt>
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<span class="sect2">
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<a href="am_misc_bulk.html#am_misc_bulk_get">Bulk retrieval</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="am_misc_bulk.html#am_misc_bulk_put">Bulk updates</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="am_misc_bulk.html#am_misc_bulk_del">Bulk deletes</a>
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</span>
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</dt>
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</dl>
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</dd>
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<dt>
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<span class="sect1">
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<a href="am_misc_partial.html">Partial record storage and
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retrieval</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="am_misc_struct.html">Storing C/C++
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structures/objects</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="am_misc_perm.html">Retrieved key/data permanence for C/C++</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="am_misc_error.html">Error support</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="am_misc_stability.html">Cursor stability</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="am_misc_dbsizes.html">Database limits</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="am_misc_diskspace.html">Disk space
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requirements</a>
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</span>
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</dt>
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<dd>
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<dl>
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<dt>
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<span class="sect2">
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<a href="am_misc_diskspace.html#idm140654539775616">Btree</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="am_misc_diskspace.html#idm140654539775488">Hash</a>
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</span>
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</dt>
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</dl>
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</dd>
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<dt>
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<span class="sect1">
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<a href="blobs.html">External File support</a>
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</span>
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</dt>
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<dd>
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<dl>
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<dt>
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<span class="sect2">
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<a href="blobs.html#blob_threshold">The external file threshold</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="blobs.html#blob_create">Creating external files</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="blobs.html#blob_access">External file access</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="blobs.html#blob_storage">External file storage</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="blobs.html#blob_replication">External Files and Replication</a>
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</span>
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</dt>
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</dl>
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</dd>
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<dt>
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<span class="sect1">
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<a href="am_misc_tune.html">Access method tuning</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="am_misc_faq.html">Access method FAQ</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="am_misc_align"></a>Data alignment</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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The Berkeley DB access methods provide no guarantees about
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byte alignment for returned key/data pairs, or callback
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functions which take <a href="../api_reference/C/dbt.html" class="olink">DBT</a> references as arguments, and
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applications are responsible for arranging any necessary
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alignment. The <a href="../api_reference/C/dbt.html#dbt_DB_DBT_MALLOC" class="olink">DB_DBT_MALLOC</a>, <a href="../api_reference/C/dbt.html#dbt_DB_DBT_REALLOC" class="olink">DB_DBT_REALLOC</a>, and
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<a href="../api_reference/C/dbt.html#dbt_DB_DBT_USERMEM" class="olink">DB_DBT_USERMEM</a> flags may be used to store returned items in
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memory of arbitrary alignment.
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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="am_cursor.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="am_misc_bulk.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">Cursor operations </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"> Retrieving and updating records in bulk</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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