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2.6 KiB
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<!--$Id: close.so,v 10.15 2000/12/18 21:05:13 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB Reference Guide: Closing a database</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>Access Methods</dl></h3></td>
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<td width="1%"><a href="../../ref/am/stat.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/am/cursor.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>Closing a database</h1>
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<p>The <a href="../../api_c/db_close.html">DB->close</a> function is the standard interface for closing the database.
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By default, <a href="../../api_c/db_close.html">DB->close</a> also flushes all modified records from the
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database cache to disk.
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<p>There is one flag that you can set to customize <a href="../../api_c/db_close.html">DB->close</a>:
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<p><dl compact>
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<p><dt><a href="../../api_c/db_close.html#DB_NOSYNC">DB_NOSYNC</a><dd>Do not flush cached information to disk.
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</dl>
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<b>It is important to understand that flushing cached information
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to disk only minimizes the window of opportunity for corrupted data, it
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does not eliminate the possibility.</b>
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<p>While unlikely, it is possible for database corruption to happen if a
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system or application crash occurs while writing data to the database. To
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ensure that database corruption never occurs, applications must either:
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<ul type=disc>
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<li>Use transactions and logging with automatic recovery.
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<li>Use logging and application-specific recovery.
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<li>Edit a copy of the database, and, once all applications
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using the database have successfully called <a href="../../api_c/db_close.html">DB->close</a>, use
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system operations (e.g., the POSIX rename system call) to atomically
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replace the original database with the updated copy.
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</ul>
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<table><tr><td><br></td><td width="1%"><a href="../../ref/am/stat.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/am/cursor.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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