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<?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">
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    <title>Chapter 3. Berkeley DB Features</title>
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          <th colspan="3" align="center">Chapter 3. Berkeley DB Features</th>
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          <div>
            <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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          <dt>
            <span class="sect1">
              <a href="dbfeatures.html#bulkloading">Using Bulk Loading</a>
            </span>
          </dt>
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            <span class="sect1">
              <a href="mvcc.html">Using Multiversion Concurrency Control</a>
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            <span class="sect1">
              <a href="selectpage_size.html">Selecting the Page Size</a>
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      <p>
            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.
        </p>
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            <div>
              <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.
            </p>
        <p>
                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.
            </p>
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