<!--$Id: log_file.html,v 1.1.1.1 2003/02/15 04:55:53 zarzycki Exp $--> <!--Copyright 1997-2002 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbEnv.log_file</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td> <h1>DbEnv.log_file</h1> </td> <td align=right> <a href="../api_java/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> import com.sleepycat.db.*; <p> public String log_file(DbLsn lsn) throws DbException; </pre></h3> <h1>Description</h1> <p>The DbEnv.log_file method maps <a href="../api_java/lsn_class.html">DbLsn</a> objects to filenames, returning the name of the file containing the record named by <b>lsn</b>. <p>The <b>len</b> argument is the length of the <b>namep</b> buffer in bytes. If <b>namep</b> is too short to hold the filename, DbEnv.log_file will return ENOMEM. (Log filenames are normally quite short, on the order of 10 characters.) <p>This mapping of <a href="../api_java/lsn_class.html">DbLsn</a> objects to files is needed for database administration. For example, a transaction manager typically records the earliest <a href="../api_java/lsn_class.html">DbLsn</a> needed for restart, and the database administrator may want to archive log files to tape when they contain only <a href="../api_java/lsn_class.html">DbLsn</a> entries before the earliest one needed for restart. <p>The DbEnv.log_file method throws an exception that encapsulates a non-zero error value on failure. <h1>Errors</h1> <p>The DbEnv.log_file method may fail and throw an exception encapsulating a non-zero error for the following conditions: <p><dl compact> <p><dt>ENOMEM<dd>The supplied buffer was too small to hold the log filename. </dl> <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. If a catastrophic error has occurred, the DbEnv.log_file method may fail and throw a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>, in which case all subsequent Berkeley DB calls will fail in the same way. <h1>Class</h1> <a href="../api_java/env_class.html">DbEnv</a>, <a href="../api_java/logc_class.html">DbLogc</a>, <a href="../api_java/lsn_class.html">DbLsn</a> <h1>See Also</h1> <a href="../api_java/log_list.html">Logging Subsystem and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../api_java/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font> </body> </html>