78 lines
3.4 KiB
HTML
78 lines
3.4 KiB
HTML
<!--$Id: memp_set_lsn_offset.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_MPOOLFILE->set_lsn_offset</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_MPOOLFILE->set_lsn_offset</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_MPOOLFILE->set_lsn_offset(DB_MPOOLFILE *mpf, int32_t lsn_offset);
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<p>
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int
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DB_MPOOLFILE->get_lsn_offset(DB_MPOOLFILE *mpf, int32_t *lsn_offsetp);
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</pre></b>
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<hr size=1 noshade>
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<b>Description: DB_MPOOLFILE->set_lsn_offset</b>
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<p>The DB_MPOOLFILE->set_lsn_offset method specifies the zero-based byte offset
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of a log sequence number (<a href="../api_c/lsn_class.html">DB_LSN</a>) on the file's pages, for the
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purposes of page-flushing as part of transaction checkpoint. (See the
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<a href="../api_c/memp_sync.html">DB_ENV->memp_sync</a> documentation for more information.)</p>
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<p>The DB_MPOOLFILE->set_lsn_offset method configures a file in the memory pool, not only
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operations performed using the specified <a href="../api_c/mempfile_class.html">DB_MPOOLFILE</a> handle.</p>
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<p>The DB_MPOOLFILE->set_lsn_offset method may not be called after the <a href="../api_c/memp_fopen.html">DB_MPOOLFILE->open</a> method is
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called.
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If the file is already open in the memory pool when
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<a href="../api_c/memp_fopen.html">DB_MPOOLFILE->open</a> is called, the information specified to DB_MPOOLFILE->set_lsn_offset
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must be consistent with the existing file or an error will be
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returned.
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</p>
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<p>The DB_MPOOLFILE->set_lsn_offset 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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<b>Parameters</b> <br>
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<b>lsn_offset</b><ul compact><li>The <b>lsn_offset</b> parameter is the zero-based byte offset of the
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log sequence number on the file's pages.</ul>
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<br>
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<hr size=1 noshade>
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<b>Description: DB_MPOOLFILE->get_lsn_offset</b>
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<p>The DB_MPOOLFILE->get_lsn_offset method returns the log sequence number byte offset.</p>
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<p>The DB_MPOOLFILE->get_lsn_offset method may be called at any time during the life of the
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application.</p>
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<p>The DB_MPOOLFILE->get_lsn_offset 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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<b>Parameters</b> <br>
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<b>lsn_offsetp</b><ul compact><li>The DB_MPOOLFILE->get_lsn_offset method returns the
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log sequence number byte offset in <b>lsn_offsetp</b>.</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/mempfile_class.html">DB_MPOOLFILE</a>
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<br><b>See Also</b>
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<a href="../api_c/memp_list.html">Memory Pools 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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