Sindbad~EG File Manager
<?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 18.1.40</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>
Sindbad File Manager Version 1.0, Coded By Sindbad EG ~ The Terrorists