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<!--$Id: txn_checkpoint.so,v 10.49 2005/03/02 22:57:15 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbEnv::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> <b>DbEnv::txn_checkpoint</b> </td> <td align=right> <a href="../../db4-devel-4.7.25/api_cxx/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_cxx.h> <p> int DbEnv::txn_checkpoint(u_int32_t kbyte, u_int32_t min, u_int32_t flags) const; </pre></b> <hr size=1 noshade> <b>Description: DbEnv::txn_checkpoint</b> <p>If there has been any logging activity in the database environment since the last checkpoint, the DbEnv::txn_checkpoint method flushes the underlying memory pool, writes a checkpoint record to the log, and then flushes the log.</p> <p>The DbEnv::txn_checkpoint method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success. </p> <b>Parameters</b> <br> <b>flags</b><ul compact><li>The <b>flags</b> parameter must be set to 0 or the following value: <br> <b><a name="DB_FORCE">DB_FORCE</a></b><ul compact><li>Force a checkpoint record, even if there has been no activity since the last checkpoint.</ul> <br></ul> <b>kbyte</b><ul compact><li>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.</ul> <b>min</b><ul compact><li>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.</ul> <br> <br><b>Errors</b> <p>The DbEnv::txn_checkpoint method may fail and throw <a href="../../db4-devel-4.7.25/api_cxx/except_class.html">DbException</a>, encapsulating one of the following non-zero errors, or 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_cxx/env_class.html">DbEnv</a>, <a href="../../db4-devel-4.7.25/api_cxx/txn_class.html">DbTxn</a> <br><b>See Also</b> <a href="../../db4-devel-4.7.25/api_cxx/txn_list.html">Transaction Subsystem and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db4-devel-4.7.25/api_cxx/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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