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77 lines
3.5 KiB
HTML
<!--$Id: log_file.so,v 10.18 2000/03/01 21:41:29 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: DbEnv.log_file</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>
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<h1>DbEnv.log_file</h1>
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</td>
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<td width="1%">
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<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>
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import com.sleepycat.db.*;
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<p>
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public String log_file(DbLsn lsn)
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throws DbException;
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</pre></h3>
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<h1>Description</h1>
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<p>The DbEnv.log_file method maps
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<a href="../api_java/lsn_class.html">DbLsn</a> objects
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to file names,
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returning the name of the file containing the record named by <b>lsn</b>.
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<p>The <b>len</b> argument is the length of the <b>namep</b> buffer in bytes.
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If <b>namep</b> is too short to hold the file name, DbEnv.log_file will
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return ENOMEM.
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(Log file names are normally quite short, on the order of 10 characters.)
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<p>This mapping of
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<a href="../api_java/lsn_class.html">DbLsn</a> objects
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to files is needed for database administration. For example, a
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transaction manager typically records the earliest
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<a href="../api_java/lsn_class.html">DbLsn</a>
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needed for restart, and the database administrator may want to archive
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log files to tape when they contain only
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<a href="../api_java/lsn_class.html">DbLsn</a>
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entries before the earliest one needed for restart.
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<p>The DbEnv.log_file method throws an exception that encapsulates a non-zero error value on
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failure.
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<h1>Errors</h1>
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<p>The DbEnv.log_file method may fail and throw an exception encapsulating a non-zero error for the following conditions:
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<p><dl compact>
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<p><dt>ENOMEM<dd>The supplied buffer was too small to hold the log file name.
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</dl>
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<p>The DbEnv.log_file method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.
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If a catastrophic error has occurred, the DbEnv.log_file method may fail and throw
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a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>, in which case all subsequent Berkeley DB calls
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will fail in the same way.
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<h3>Class</h3>
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<a href="../api_java/dbenv_class.html">DbEnv</a>
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<h1>See Also</h1>
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<a href="../api_java/env_set_lg_bsize.html">DbEnv.set_lg_bsize</a>,
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<a href="../api_java/env_set_lg_max.html">DbEnv.set_lg_max</a>,
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<a href="../api_java/log_archive.html">DbEnv.log_archive</a>,
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<a href="../api_java/log_compare.html">DbEnv.log_compare</a>,
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<a href="../api_java/log_file.html">DbEnv.log_file</a>,
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<a href="../api_java/log_flush.html">DbEnv.log_flush</a>,
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<a href="../api_java/log_get.html">DbEnv.log_get</a>,
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<a href="../api_java/log_put.html">DbEnv.log_put</a>,
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<a href="../api_java/log_register.html">DbEnv.log_register</a>,
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<a href="../api_java/log_stat.html">DbEnv.log_stat</a>
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and
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<a href="../api_java/log_unregister.html">DbEnv.log_unregister</a>.
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</tt>
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<table><tr><td><br></td><td width="1%">
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<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></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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