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        <p>Library Version 18.1.40</p>
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          <th width="60%" align="center">Chapter 16.  Programmer Notes </th>
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            <h2 class="title" style="clear: both"><a id="program_compatible"></a>Compatibility with historic UNIX interfaces</h2>
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      <p>
        The Berkeley DB version 2 library provides
        backward-compatible interfaces for the historic UNIX <a href="../api_reference/C/dbm.html" class="olink">dbm</a>,
        <a href="../api_reference/C/dbm.html" class="olink">ndbm</a> and <a href="../api_reference/C/hsearch.html" class="olink">hsearch</a> interfaces. It also provides a
        backward-compatible interface for the historic Berkeley DB
        1.85 release.
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        Berkeley DB version 2 does not provide database
        compatibility for any of the previous interfaces, and existing
        databases must be converted manually. To convert existing
        databases from the Berkeley DB 1.85 format to the Berkeley DB
        version 2 format, review the <a href="../api_reference/C/db_dump.html" class="olink">db_dump185</a> utility and the <a href="../api_reference/C/db_load.html" class="olink">db_load</a> utility
        information. No utilities are provided to convert UNIX <a href="../api_reference/C/dbm.html" class="olink">dbm</a>,
        <a href="../api_reference/C/dbm.html" class="olink">ndbm</a> or <a href="../api_reference/C/hsearch.html" class="olink">hsearch</a> databases.
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