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<h2 class="title"><a id="dbfeatures"></a>Chapter 3. Berkeley DB Features</h2>
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<b>Table of Contents</b>
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<span class="sect1">
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When using the Berkeley DB SQL API, there are features that you
can manage using PRAGMAs that are unique to Berkeley DB. This
chapter discusses these features.
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<h2 class="title" style="clear: both"><a id="bulkloading"></a>Using Bulk Loading</h2>
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<p>
Bulk loading is an I/O optimization feature that is useful
when loading large amounts of data to the database inside
of a single transaction.
The bulk load optimization avoids writing some log records to
the journal file. This can provide significant performance
benefits when loading a large number of new rows into a
database.
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When you use bulk load, nested transactions are
disabled. This means that you cannot undo any
single operation. Instead, if you want to undo a
given operation, you must undo everything performed
within the transaction.
</p>
<p>
It is not possible to use the bulk load functionality when
replication is enabled.
</p>
<p>
To enable bulk loading, use:
</p>
<p>
<span class="bold"><strong>PRAGMA TXN_BULK</strong></span> = 0 | 1;
</p>
<p>
Default value is <code class="literal">0</code>, which means the
PRAGMA is turned off and so bulk loading is not in use.
<code class="literal">1</code> means bulk loading is in use.
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