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130 lines
5.0 KiB
130 lines
5.0 KiB
<?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 3. Berkeley DB Features</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="Getting Started with the Oracle Berkeley DB SQL APIs" />
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<link rel="up" href="index.html" title="Getting Started with the Oracle Berkeley DB SQL APIs" />
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<link rel="prev" href="lockhandling.html" title="Lock Handling" />
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<link rel="next" href="mvcc.html" title="Using Multiversion Concurrency Control" />
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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 12.1.6.2</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 3. Berkeley DB Features</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="lockhandling.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="mvcc.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="dbfeatures"></a>Chapter 3. Berkeley DB Features</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="dbfeatures.html#bulkloading">Using Bulk Loading</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="mvcc.html">Using Multiversion Concurrency Control</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="selectpage_size.html">Selecting the Page Size</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="control_log_file.html">Controlling the Number of Accumulated Log Files</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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<p>
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When using the Berkeley DB SQL API, there are features that you
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can manage using PRAGMAs that are unique to Berkeley DB. This
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chapter discusses these features.
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</p>
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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="bulkloading"></a>Using Bulk Loading</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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Bulk loading is an I/O optimization feature that is useful
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when loading large amounts of data to the database inside
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of a single transaction.
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The bulk load optimization avoids writing some log records to
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the journal file. This can provide significant performance
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benefits when loading a large number of new rows into a
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database.
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</p>
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<p>
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When you use bulk load, nested transactions are
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disabled. This means that you cannot undo any
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single operation. Instead, if you want to undo a
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given operation, you must undo everything performed
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within the transaction.
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</p>
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<p>
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It is not possible to use the bulk load functionality when
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replication is enabled.
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</p>
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<p>
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To enable bulk loading, use:
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</p>
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<p>
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<span class="bold"><strong>PRAGMA TXN_BULK</strong></span> = 0 | 1;
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</p>
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<p>
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Default value is <code class="literal">0</code>, which means the
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PRAGMA is turned off and so bulk loading is not in use.
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<code class="literal">1</code> means bulk loading is in use.
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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="lockhandling.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="mvcc.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">Lock Handling </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"> Using Multiversion Concurrency Control</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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