77 lines
3.1 KiB
HTML
77 lines
3.1 KiB
HTML
<!--$Id: env_lsn_reset.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->lsn_reset</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->lsn_reset</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->lsn_reset(DB_ENV *dbenv, const char *file, 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->lsn_reset</b>
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<p>The DB_ENV->lsn_reset method allows database files to be moved from one
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transactional database environment to another.</p>
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<p>Database pages in transactional database environments contain references
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to the environment's log files (that is, log sequence numbers, or LSNs).
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Copying or moving a database file from one database environment to
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another, and then modifying it, can result in data corruption if the
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LSNs are not first cleared.</p>
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<p>Note that LSNs should be reset before moving or copying the database
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file into a new database environment, rather than moving or copying the
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database file and then resetting the LSNs. Berkeley DB has consistency checks
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that may be triggered if an application calls DB_ENV->lsn_reset
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on a database in a new environment when the database LSNs still reflect
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the old environment.</p>
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<p>The DB_ENV->lsn_reset method modifies the physical file, in-place.
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Applications should not reset LSNs in files that are currently in use.</p>
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<p>The DB_ENV->lsn_reset 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_ENV->lsn_reset 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>file</b><ul compact><li>The name of the physical file in which the LSNs are to be cleared.</ul>
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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>DB_ENCRYPT</b><ul compact><li>The file contains encrypted databases.</ul>
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<br></ul>
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<br>
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<br><b>Errors</b>
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<p>The DB_ENV->lsn_reset 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>
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<br><b>See Also</b>
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<a href="../api_c/env_list.html">Database Environments 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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