73 lines
3.1 KiB
HTML
73 lines
3.1 KiB
HTML
<!--$Id: txn_checkpoint.html 63573 2008-05-23 21:43:21Z trent.nelson $-->
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<!--Copyright (c) 1997,2008 Oracle. All rights reserved.-->
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<!--See the file LICENSE for redistribution information.-->
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<html>
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<head>
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<title>Berkeley DB: DB_ENV->txn_checkpoint</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,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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<table width="100%"><tr valign=top>
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<td>
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<b>DB_ENV->txn_checkpoint</b>
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</td>
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<td align=right>
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<a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a>
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<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td>
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</tr></table>
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<hr size=1 noshade>
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<tt>
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<b><pre>
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#include <db.h>
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<p>
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int
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DB_ENV->txn_checkpoint(const DB_ENV *env,
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u_int32_t kbyte, u_int32_t min, u_int32_t flags);
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</pre></b>
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<hr size=1 noshade>
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<b>Description: DB_ENV->txn_checkpoint</b>
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<p>If there has been any logging activity in the database environment since
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the last checkpoint, the DB_ENV->txn_checkpoint method flushes the underlying
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memory pool, writes a checkpoint record to the log, and then flushes the
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log.</p>
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<p>The DB_ENV->txn_checkpoint method
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returns a non-zero error value on failure
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and 0 on success.
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</p>
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<p>The DB_ENV->txn_checkpoint method is the underlying method used by the <a href="../utility/db_checkpoint.html">db_checkpoint</a> utility.
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See the <a href="../utility/db_checkpoint.html">db_checkpoint</a> utility source code for an example of using DB_ENV->txn_checkpoint
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in a IEEE/ANSI Std 1003.1 (POSIX) environment.</p>
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<b>Parameters</b> <br>
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<b>flags</b><ul compact><li>The <b>flags</b> parameter must be set to 0 or
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the following value:
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<br>
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<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
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last checkpoint.</ul>
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<br></ul>
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<b>kbyte</b><ul compact><li>If the <b>kbyte</b> parameter is non-zero, a checkpoint will be done
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if more than <b>kbyte</b> kilobytes of log data have been written since
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the last checkpoint.</ul>
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<b>min</b><ul compact><li>If the <b>min</b> parameter is non-zero, a checkpoint will be done if
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more than <b>min</b> minutes have passed since the last checkpoint.</ul>
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<br>
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<br><b>Errors</b>
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<p>The DB_ENV->txn_checkpoint method
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may fail and return one of the following non-zero errors:</p>
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<br>
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<b>EINVAL</b><ul compact><li>An
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invalid flag value or parameter was specified.</ul>
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<br>
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<hr size=1 noshade>
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<br><b>Class</b>
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<a href="../api_c/env_class.html">DB_ENV</a>, <a href="../api_c/txn_class.html">DB_TXN</a>
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<br><b>See Also</b>
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<a href="../api_c/txn_list.html">Transaction Subsystem and Related Methods</a>
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</tt>
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<table width="100%"><tr><td><br></td><td align=right>
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<a href="../api_c/api_core.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>Copyright (c) 1996,2008 Oracle. All rights reserved.</font>
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</body>
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</html>
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