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<!--$Id: log_printf.so,v 1.1 2005/09/30 19:00:24 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DB_ENV->log_printf</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td> <b>DB_ENV->log_printf</b> </td> <td align=right> <a href="../../db4-devel-4.7.25/api_c/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a> <a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <b><pre> #include <db.h> <p> int DB_ENV->log_printf(DB_ENV *env, DB_TXN *txnid, const char *fmt, ...); </pre></b> <hr size=1 noshade> <b>Description: DB_ENV->log_printf</b> <p>The DB_ENV->log_printf method appends an informational message to the Berkeley DB database environment log files.</p> <p>The DB_ENV->log_printf method allows applications to include information in the database environment log files, for later review using the <a href="../../db4-utils-4.7.25/utility/db_printlog.html">db_printlog</a> utility. This method is intended for debugging and performance tuning.</p> <p>The DB_ENV->log_printf method returns a non-zero error value on failure and 0 on success. </p> <b>Parameters</b> <br> <b>txnid</b><ul compact><li>If the logged message refers to an application-specified transaction, the <b>txnid</b> parameter is a transaction handle returned from <a href="../../db4-devel-4.7.25/api_c/txn_begin.html">DB_ENV->txn_begin</a>; otherwise NULL.</ul> <b>fmt</b><ul compact><li>A format string that specifies how subsequent arguments (or arguments accessed via the variable-length argument facilities of stdarg(3)) are converted for output. The format string may contain any formatting directives supported by the underlying C library vsnprintf(3) function.</ul> <br> <br><b>Errors</b> <p>The DB_ENV->log_printf method may fail and return one of the following non-zero errors:</p> <br> <b>EINVAL</b><ul compact><li>An invalid flag value or parameter was specified.</ul> <br> <hr size=1 noshade> <br><b>Class</b> <a href="../../db4-devel-4.7.25/api_c/env_class.html">DB_ENV</a>, <a href="../../db4-devel-4.7.25/api_c/logc_class.html">DB_LOGC</a>, <a href="../../db4-devel-4.7.25/api_c/lsn_class.html">DB_LSN</a> <br><b>See Also</b> <a href="../../db4-devel-4.7.25/api_c/log_list.html">Logging Subsystem and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db4-devel-4.7.25/api_c/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a><a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>
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