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130 lines
6.1 KiB
HTML
130 lines
6.1 KiB
HTML
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<?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>Replication</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 Upgrade Guide" />
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<link rel="up" href="upgrade_4_2_toc.html" title="Chapter 8. Upgrading Berkeley DB 4.1 applications to Berkeley DB 4.2" />
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<link rel="prev" href="upgrade_4_2_lockng.html" title="DB_LOCK_NOTGRANTED" />
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<link rel="next" href="upgrade_4_2_nosync.html" title="Client replication environments" />
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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 11.2.5.2</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">Replication</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="upgrade_4_2_lockng.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 8. Upgrading Berkeley DB 4.1 applications to Berkeley DB 4.2</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_4_2_nosync.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="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="upgrade_4_2_repinit"></a>Replication</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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<dl>
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<dt>
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<span class="sect2">
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<a href="upgrade_4_2_repinit.html#id3841262">Replication initialization</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="upgrade_4_2_repinit.html#id3840754">Database methods and replication clients</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="upgrade_4_2_repinit.html#id3840852">DB_ENV->rep_process_message()</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="sect2" 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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<h3 class="title"><a id="id3841262"></a>Replication initialization</h3>
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</div>
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</div>
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</div>
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<p>In the Berkeley DB 4.2 release, replication environments must be specifically
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initialized by any process that will ever do anything other than open
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databases in read-only mode (that is, any process which might call any
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of the Berkeley DB replication interfaces or modify databases). This
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initialization is done when the replication database environment handle
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is opened, by specifying the <a href="../api_reference/C/envopen.html#envopen_DB_INIT_REP" class="olink">DB_INIT_REP</a> flag to the
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<a href="../api_reference/C/envopen.html" class="olink">DB_ENV->open()</a> method.</p>
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</div>
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<div class="sect2" 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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<h3 class="title"><a id="id3840754"></a>Database methods and replication clients</h3>
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</div>
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</div>
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</div>
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<p>All of the <a href="../api_reference/C/db.html" class="olink">DB</a> object methods may now return
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<code class="literal">DB_REP_HANDLE_DEAD</code> when a replication client changes masters.
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When this happens the <a href="../api_reference/C/db.html" class="olink">DB</a> handle is no longer able to be used and
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the application must close the handle using the <a href="../api_reference/C/dbclose.html" class="olink">DB->close()</a> method and
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open a new handle. This new return value is returned when a client
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unrolls a transaction in order to synchronize with the new master.
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Otherwise, if the application was permitted to use the original handle,
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it's possible the handle might attempt to access nonexistent resources.</p>
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</div>
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<div class="sect2" 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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<h3 class="title">
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<a id="id3840852"></a>
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<a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a>
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</h3>
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</div>
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</div>
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</div>
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<p>The <a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a> method has new return values and an log sequence
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number (LSN) associated with those return values. The new argument is
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<span class="bold"><strong>ret_lsnp</strong></span>, which is the returned LSN when the
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<a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a> method returns <a href="../api_reference/C/repmessage.html#repmsg_DB_REP_ISPERM" class="olink">DB_REP_ISPERM</a> or <a href="../api_reference/C/repmessage.html#repmsg_DB_REP_NOTPERM" class="olink">DB_REP_NOTPERM</a>. See
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<a href="../programmer_reference/rep_trans.html" class="olink">Transactional guarantees</a> for more information.</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="upgrade_4_2_lockng.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="upgrade_4_2_toc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_4_2_nosync.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">DB_LOCK_NOTGRANTED </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"> Client replication environments</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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