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<h2 class="title"><a id="admin"></a>Chapter 5. Administrating Berkeley DB SQL Databases</h2>
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<div class="toc">
<p>
<b>Table of Contents</b>
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<dl>
<dt>
<span class="sect1">
<a href="admin.html#backup">Backing Up Berkeley DB SQL Databases</a>
</span>
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<dd>
<dl>
<dt>
<span class="sect2">
<a href="admin.html#idp50739296">Backing Up Replicated Berkeley DB SQL Databases</a>
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<span class="sect1">
<a href="sync.html">Syncing with Oracle Databases</a>
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<a href="sync.html#syncwinmobile">Syncing on Windows Mobile Platforms</a>
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<span class="sect2">
<a href="datamigration.html#shellmigrate">Migration Using the Shells</a>
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<p>
This chapter provides administrative procedures that are unique
to the Berkeley DB SQL interface.
</p>
<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="backup"></a>Backing Up Berkeley DB SQL Databases</h2>
</div>
</div>
</div>
<div class="toc">
<dl>
<dt>
<span class="sect2">
<a href="admin.html#idp50739296">Backing Up Replicated Berkeley DB SQL Databases</a>
</span>
</dt>
</dl>
</div>
<p>
You can use the standard SQLite <code class="literal">.dump</code>
command to backup the data managed by the BDB SQL interface.
</p>
<p>
The BDB SQL interface supports the standard SQLite Online Backup API.
However, there is a small difference between the two interfaces.
In the BDB SQL interface, the value returned by the <code class="literal">sqlite3_backup_remaining</code> method
and the number of pages passed to the <code class="literal">sqlite3_backup_step</code> method,
are estimates of the number of pages to be copied and not exact values.
To be certain that the backup process is complete,
check if the <code class="literal">sqlite3_backup_step</code> method has returned <code class="literal">SQLITE_DONE</code>.
To learn how to use SQLite Online Backup API, see the official <a class="ulink" href="http://www.sqlite.org/backup.html" target="_top">SQLite
Documentation Page.</a>
</p>
<p>
If you are using replication, you will also need to copy the
file that contains the replication pragma information in order
to have a full backup. To do that copy the file named <code class="literal">
pragma</code> from the database journal directory.
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp50739296"></a>Backing Up Replicated Berkeley DB SQL Databases</h3>
</div>
</div>
</div>
<p>
When BDB SQL interface databases are replicated the process for backing up
a regular database should be followed. The user must then copy
some additional files for the backup to be complete.
</p>
<p>
The additional files can be found in the journal directory of
the source database, and should be copied into the journal
directory of the backup copy. The journal directory is
automatically created when a Berkeley DB SQL interface database is created.
The journal directory is created in the same directory as the
database file, it has the name of the database file with a
<code class="literal">-journal</code> appendix.
</p>
<p>
The files that need to be copied into the backup journal directory are:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<code class="literal">__db.rep.egen</code>
</li>
<li>
<code class="literal">__db.rep.gen</code>
</li>
<li>
<code class="literal">__db.rep.init</code>
</li>
<li>
<code class="literal">__db.rep.system</code>
</li>
</ul>
</div>
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</p>
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