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<!--$Id: utility.so,v 10.15 2000/12/04 20:49:18 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<html>
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<head>
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<title>Berkeley DB Reference Guide: The db_dump and db_load utilities</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Dumping and Reloading</dl></h3></td>
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<td width="1%"><a href="../../ref/sendmail/intro.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/dumpload/format.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p>
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<h1 align=center>The db_dump and db_load utilities</h1>
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<p>There are three utilities used for dumping and loading Berkeley DB
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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>.
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<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
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databases into a flat-text representation of the data that can
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be read by <a href="../../utility/db_load.html">db_load</a>. The only difference between them
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is that <a href="../../utility/db_dump.html">db_dump</a> reads Berkeley DB version 2 and greater
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database formats, while <a href="../../utility/db_dump.html">db_dump185</a> reads Berkeley DB version
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1.85 and 1.86 database formats.
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<p>The <a href="../../utility/db_load.html">db_load</a> utility reads either the output format used
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by the dump utilities or, optionally, a flat-text representation
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created using other tools, and stores it into a Berkeley DB database.
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<p>Dumping and reloading Hash databases that use user-defined hash functions
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will result in new databases that use the default hash function. While
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using the default hash function may not be optimal for the new database,
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it will continue to work correctly.
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<p>Dumping and reloading Btree databases that use user-defined prefix or
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comparison functions will result in new databases that use the default
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prefix and comparison functions. In which case it is quite likely that
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applications will be unable to retrieve records, and possible that the
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load process itself will fail.
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<p>The only available workaround for either Hash or Btree databases is to
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modify the sources for the <a href="../../utility/db_load.html">db_load</a> utility to load the database
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using the correct hash, prefix and comparison functions.
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<table><tr><td><br></td><td width="1%"><a href="../../ref/sendmail/intro.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/dumpload/format.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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</body>
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</html>
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