mirror of
https://github.com/yasuhirokimura/db18
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Yasuhiro KIMURA
120 lines
5.0 KiB
HTML
120 lines
5.0 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>Replication environment IDs</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="rep.html" title="Chapter 12. Berkeley DB Replication" />
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<link rel="prev" href="rep.html" title="Chapter 12. Berkeley DB Replication" />
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<link rel="next" href="rep_pri.html" title="Replication environment priorities" />
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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">Replication environment IDs</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="rep.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 12. Berkeley DB Replication </th>
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<td width="20%" align="right"> <a accesskey="n" href="rep_pri.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="rep_id"></a>Replication environment IDs</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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Each database environment included in a replication group
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must have a unique identifier for itself and for the other
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members of the replication group. The identifiers do not need
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to be global, that is, each database environment can assign
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local identifiers to members of the replication group as it
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encounters them. For example, given three sites: A, B and C,
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site A might assign the identifiers 1 and 2 to sites B and C
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respectively, while site B might assign the identifiers 301
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and 302 to sites A and C respectively. Note that it is not
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wrong to have global identifiers, it is just not a
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requirement.
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</p>
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<p>
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Replication Manager assigns and manages environment IDs on
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behalf of the application.
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</p>
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<p>
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It is the responsibility of a Base API application to label
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each incoming replication message passed to <a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a>
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method with the appropriate identifier. Subsequently, Berkeley
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DB will label outgoing messages to the <span class="bold"><strong>send</strong></span>
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function with those same
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identifiers.
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</p>
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<p>
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Negative identifiers are reserved for use by Berkeley DB,
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and should never be assigned to environments by the
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application. Two of these reserved identifiers are intended
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for application use, as follows:
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</p>
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<div class="variablelist">
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<dl>
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<dt>
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<span class="term">
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<a href="../api_reference/C/reptransport.html#transport_DB_EID_BROADCAST" class="olink">DB_EID_BROADCAST</a>
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</span>
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</dt>
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<dd>
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<p>
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The <a href="../api_reference/C/reptransport.html#transport_DB_EID_BROADCAST" class="olink">DB_EID_BROADCAST</a> identifier indicates a
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message should be broadcast to all members of a
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replication group.
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</p>
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</dd>
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<dt>
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<a id="rep_id.DB_EID_INVALID"></a>
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<span class="term">DB_EID_INVALID</span>
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</dt>
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<dd>
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<p>
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The DB_EID_INVALID identifier is an invalid
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environment ID, and may be used to initialize
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environment ID variables that are subsequently
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checked for validity.
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</p>
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</dd>
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</dl>
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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="rep.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="rep.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="rep_pri.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">Chapter 12. Berkeley DB Replication </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"> Replication environment priorities</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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