<!--$Id: txn_checkpoint.so,v 10.49 2005/03/02 22:57:15 bostic Exp $--> <!--Copyright (c) 1997,2007 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DB_ENV->txn_checkpoint</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> <h3>DB_ENV->txn_checkpoint</h3> </td> <td align=right> <a href="../../db46-devel-4.6.21/api_c/api_core.html"><img src="../../db46-devel-4.6.21/images/api.gif" alt="API"></a> <a href="../../db46-devel-4.6.21/ref/toc.html"><img src="../../db46-devel-4.6.21/images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db.h> <p> int DB_ENV->txn_checkpoint(const DB_ENV *env, u_int32_t kbyte, u_int32_t min, u_int32_t flags); </pre></h3> <hr size=1 noshade> <h3>Description: DB_ENV->txn_checkpoint</h3> <p>If there has been any logging activity in the database environment since the last checkpoint, the DB_ENV->txn_checkpoint method flushes the underlying memory pool, writes a checkpoint record to the log, and then flushes the log.</p> <p>The DB_ENV->txn_checkpoint method returns a non-zero error value on failure and 0 on success. </p> <p>The DB_ENV->txn_checkpoint method is the underlying method used by the <a href="../../db46-utils-4.6.21/utility/db_checkpoint.html">db_checkpoint</a> utility. See the <a href="../../db46-utils-4.6.21/utility/db_checkpoint.html">db_checkpoint</a> utility source code for an example of using DB_ENV->txn_checkpoint in a IEEE/ANSI Std 1003.1 (POSIX) environment.</p> <h3>Parameters</h3> <dl compact> <dt><b>flags</b><dd>The <b>flags</b> parameter must be set to 0 or the following value: <dl compact> <dt><a name="DB_FORCE">DB_FORCE</a><dd>Force a checkpoint record, even if there has been no activity since the last checkpoint. </dl> <dt><b>kbyte</b><dd>If the <b>kbyte</b> parameter is non-zero, a checkpoint will be done if more than <b>kbyte</b> kilobytes of log data have been written since the last checkpoint. <dt><b>min</b><dd>If the <b>min</b> parameter is non-zero, a checkpoint will be done if more than <b>min</b> minutes have passed since the last checkpoint. </dl> <h3>Errors</h3> <p>The DB_ENV->txn_checkpoint method may fail and return one of the following non-zero errors:</p> <dl compact> <dt>EINVAL<dd>An invalid flag value or parameter was specified. </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../../db46-devel-4.6.21/api_c/env_class.html">DB_ENV</a>, <a href="../../db46-devel-4.6.21/api_c/txn_class.html">DB_TXN</a> <h3>See Also</h3> <a href="../../db46-devel-4.6.21/api_c/txn_list.html">Transaction Subsystem and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db46-devel-4.6.21/api_c/api_core.html"><img src="../../db46-devel-4.6.21/images/api.gif" alt="API"></a><a href="../../db46-devel-4.6.21/ref/toc.html"><img src="../../db46-devel-4.6.21/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2007 Oracle. All rights reserved.</font> </body> </html>