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Import BSDDB 4.7.25 (as of svn r89086)

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Zachary Ware
2017-09-04 13:40:25 -05:00
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<!--$Id: env_lsn_reset.html 63573 2008-05-23 21:43:21Z trent.nelson $-->
<!--Copyright (c) 1997,2008 Oracle. All rights reserved.-->
<!--See the file LICENSE for redistribution information.-->
<html>
<head>
<title>Berkeley DB: DbEnv::lsn_reset</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++">
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<table width="100%"><tr valign=top>
<td>
<b>DbEnv::lsn_reset</b>
</td>
<td align=right>
<a href="../api_cxx/api_core.html"><img src="../images/api.gif" alt="API"></a>
<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td>
</tr></table>
<hr size=1 noshade>
<tt>
<b><pre>
#include &lt;db_cxx.h&gt;
<p>
int
DbEnv::lsn_reset(const char *file, u_int32_t flags);
</pre></b>
<hr size=1 noshade>
<b>Description: DbEnv::lsn_reset</b>
<p>The DbEnv::lsn_reset method allows database files to be moved from one
transactional database environment to another.</p>
<p>Database pages in transactional database environments contain references
to the environment's log files (that is, log sequence numbers, or LSNs).
Copying or moving a database file from one database environment to
another, and then modifying it, can result in data corruption if the
LSNs are not first cleared.</p>
<p>Note that LSNs should be reset before moving or copying the database
file into a new database environment, rather than moving or copying the
database file and then resetting the LSNs. Berkeley DB has consistency checks
that may be triggered if an application calls DbEnv::lsn_reset
on a database in a new environment when the database LSNs still reflect
the old environment.</p>
<p>The DbEnv::lsn_reset method modifies the physical file, in-place.
Applications should not reset LSNs in files that are currently in use.</p>
<p>The DbEnv::lsn_reset method may be called at any time during the life of the
application.</p>
<p>The DbEnv::lsn_reset 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>file</b><ul compact><li>The name of the physical file in which the LSNs are to be cleared.</ul>
<b>flags</b><ul compact><li>The <b>flags</b> parameter must be set to 0 or
the following value:
<br>
<b>DB_ENCRYPT</b><ul compact><li>The file contains encrypted databases.</ul>
<br></ul>
<br>
<br><b>Errors</b>
<p>The DbEnv::lsn_reset method
may fail and throw
<a href="../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="../api_cxx/env_class.html">DbEnv</a>
<br><b>See Also</b>
<a href="../api_cxx/env_list.html">Database Environments and Related Methods</a>
</tt>
<table width="100%"><tr><td><br></td><td align=right>
<a href="../api_cxx/api_core.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
</td></tr></table>
<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font>
</body>
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