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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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