mirror of
https://github.com/berkeleydb/libdb.git
synced 2024-11-16 17:16:25 +00:00
110 lines
4.8 KiB
HTML
110 lines
4.8 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
|
||
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||
<html xmlns="http://www.w3.org/1999/xhtml">
|
||
<head>
|
||
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
|
||
<title>Replication environment IDs</title>
|
||
<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
|
||
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
|
||
<link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
|
||
<link rel="up" href="rep.html" title="Chapter 12. Berkeley DB Replication" />
|
||
<link rel="prev" href="rep.html" title="Chapter 12. Berkeley DB Replication" />
|
||
<link rel="next" href="rep_pri.html" title="Replication environment priorities" />
|
||
</head>
|
||
<body>
|
||
<div xmlns="" class="navheader">
|
||
<div class="libver">
|
||
<p>Library Version 11.2.5.2</p>
|
||
</div>
|
||
<table width="100%" summary="Navigation header">
|
||
<tr>
|
||
<th colspan="3" align="center">Replication environment IDs</th>
|
||
</tr>
|
||
<tr>
|
||
<td width="20%" align="left"><a accesskey="p" href="rep.html">Prev</a> </td>
|
||
<th width="60%" align="center">Chapter 12.
|
||
Berkeley DB Replication
|
||
</th>
|
||
<td width="20%" align="right"> <a accesskey="n" href="rep_pri.html">Next</a></td>
|
||
</tr>
|
||
</table>
|
||
<hr />
|
||
</div>
|
||
<div class="sect1" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h2 class="title" style="clear: both"><a id="rep_id"></a>Replication environment IDs</h2>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>Each database environment included in a replication group must have a
|
||
unique identifier for itself and for the other members of the
|
||
replication group. The identifiers do not need to be global, that is,
|
||
each database environment can assign local identifiers to members of
|
||
the replication group as it encounters them. For example, given three
|
||
sites: A, B and C, site A might assign the identifiers 1 and 2 to sites
|
||
B and C respectively, while site B might assign the identifiers 301 and
|
||
302 to sites A and C respectively. Note that it is not wrong to have
|
||
global identifiers, it is just not a requirement.</p>
|
||
<p>
|
||
Replication Manager assigns and manages environment IDs on behalf of
|
||
the application.
|
||
</p>
|
||
<p>It is the responsibility of a Base API application to label each incoming
|
||
replication message passed to <a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a> method with the appropriate
|
||
identifier. Subsequently, Berkeley DB will label outgoing messages to the
|
||
<span class="bold"><strong>send</strong></span> function with those same identifiers.</p>
|
||
<p>Negative identifiers are reserved for use by Berkeley DB, and should never be
|
||
assigned to environments by the application. Two of these reserved
|
||
identifiers are intended for application use, as follows:</p>
|
||
<div class="variablelist">
|
||
<dl>
|
||
<dt>
|
||
<span class="term">
|
||
<a href="../api_reference/C/reptransport.html#transport_DB_EID_BROADCAST" class="olink">DB_EID_BROADCAST</a>
|
||
</span>
|
||
</dt>
|
||
<dd>
|
||
<p>
|
||
The <a href="../api_reference/C/reptransport.html#transport_DB_EID_BROADCAST" class="olink">DB_EID_BROADCAST</a> identifier indicates a message should be
|
||
broadcast to all members of a replication group.
|
||
</p>
|
||
</dd>
|
||
<dt>
|
||
<a id="rep_id.DB_EID_INVALID"></a>
|
||
<span class="term">DB_EID_INVALID</span>
|
||
</dt>
|
||
<dd>
|
||
<p>
|
||
The DB_EID_INVALID identifier is an invalid environment ID,
|
||
and may be used to initialize environment ID variables that
|
||
are subsequently checked for validity.
|
||
</p>
|
||
</dd>
|
||
</dl>
|
||
</div>
|
||
</div>
|
||
<div class="navfooter">
|
||
<hr />
|
||
<table width="100%" summary="Navigation footer">
|
||
<tr>
|
||
<td width="40%" align="left"><a accesskey="p" href="rep.html">Prev</a> </td>
|
||
<td width="20%" align="center">
|
||
<a accesskey="u" href="rep.html">Up</a>
|
||
</td>
|
||
<td width="40%" align="right"> <a accesskey="n" href="rep_pri.html">Next</a></td>
|
||
</tr>
|
||
<tr>
|
||
<td width="40%" align="left" valign="top">Chapter 12.
|
||
Berkeley DB Replication
|
||
</td>
|
||
<td width="20%" align="center">
|
||
<a accesskey="h" href="index.html">Home</a>
|
||
</td>
|
||
<td width="40%" align="right" valign="top"> Replication environment priorities</td>
|
||
</tr>
|
||
</table>
|
||
</div>
|
||
</body>
|
||
</html>
|