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<title>Berkeley DB Reference Guide: The db_dump and db_load utilities</title>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Dumping and Reloading</dl></h3></td>
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<h1 align=center>The db_dump and db_load utilities</h1>
<p>There are three utilities used for dumping and loading Berkeley DB
databases: <a href="../../utility/db_dump.html">db_dump</a>, <a href="../../utility/db_dump.html">db_dump185</a> and <a href="../../utility/db_load.html">db_load</a>.
<p>The <a href="../../utility/db_dump.html">db_dump</a> and <a href="../../utility/db_dump.html">db_dump185</a> utilities dump Berkeley DB
databases into a flat-text representation of the data that can
be read by <a href="../../utility/db_load.html">db_load</a>. The only difference between them
is that <a href="../../utility/db_dump.html">db_dump</a> reads Berkeley DB version 2 and greater
database formats, while <a href="../../utility/db_dump.html">db_dump185</a> reads Berkeley DB version
1.85 and 1.86 database formats.
<p>The <a href="../../utility/db_load.html">db_load</a> utility reads either the output format used
by the dump utilities or, optionally, a flat-text representation
created using other tools, and stores it into a Berkeley DB database.
<p>Dumping and reloading Hash databases that use user-defined hash functions
will result in new databases that use the default hash function. While
using the default hash function may not be optimal for the new database,
it will continue to work correctly.
<p>Dumping and reloading Btree databases that use user-defined prefix or
comparison functions will result in new databases that use the default
prefix and comparison functions. In which case it is quite likely that
applications will be unable to retrieve records, and possible that the
load process itself will fail.
<p>The only available workaround for either Hash or Btree databases is to
modify the sources for the <a href="../../utility/db_load.html">db_load</a> utility to load the database
using the correct hash, prefix and comparison functions.
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