<!--$Id: memp_set_priority.so,v 10.19 2003/11/08 19:17:41 bostic Exp $--> <!--Copyright 1997-2003 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbMpoolFile::set_priority</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td> <h3>DbMpoolFile::set_priority</h3> </td> <td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a> <a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db_cxx.h> <p> int DbMpoolFile::set_priority(DB_CACHE_PRIORITY priority); <p> int DbMpoolFile::get_priority(DB_CACHE_PRIORITY *priorityp); </pre></h3> <hr size=1 noshade> <h3>Description: DbMpoolFile::set_priority</h3> <a name="3"><!--meow--></a> <p>Set the cache priority for pages from the specified file. The priority of a page biases the replacement algorithm to be more or less likely to discard a page when space is needed in the buffer pool. The bias is temporary, and pages will eventually be discarded if they are not referenced again. The DbMpoolFile::set_priority method is only advisory, and does not guarantee pages will be treated in a specific way.</p> <p>To set the priority for the pages belonging to a particular database, call the DbMpoolFile::set_priority method using the <a href="../../db42-devel-4.2.52/api_cxx/mempfile_class.html">DbMpoolFile</a> handle returned by calling the <a href="../../db42-devel-4.2.52/api_cxx/db_get_mpf.html">Db::get_mpf</a> method.</p> <p>The DbMpoolFile::set_priority method may be called at any time during the life of the application.</p> <p>The DbMpoolFile::set_priority 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> <h3>Parameters</h3> <p><dl compact> <p><dt><b>priority</b><dd> The <b>priority</b> parameter must be set to one of the following values: <p><dl compact> <p><dt><a name="DB_PRIORITY_VERY_LOW">DB_PRIORITY_VERY_LOW</a><dd>The lowest priority: pages are the most likely to be discarded. <dt><a name="DB_PRIORITY_LOW">DB_PRIORITY_LOW</a><dd>The next lowest priority. <dt><a name="DB_PRIORITY_DEFAULT">DB_PRIORITY_DEFAULT</a><dd>The default priority. <dt><a name="DB_PRIORITY_HIGH">DB_PRIORITY_HIGH</a><dd>The next highest priority. <dt><a name="DB_PRIORITY_VERY_HIGH">DB_PRIORITY_VERY_HIGH</a><dd>The highest priority: pages are the least likely to be discarded. </dl> </dl> <hr size=1 noshade> <h3>Description: DbMpoolFile::get_priority</h3> <p>The DbMpoolFile::get_priority method returns the cache priority.</p> <p>The DbMpoolFile::get_priority method may be called at any time during the life of the application.</p> <p>The DbMpoolFile::get_priority 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> <h3>Parameters</h3> <p><dl compact> <p><dt><b>priorityp</b><dd> The DbMpoolFile::get_priority method returns the cache priority in <b>priorityp</b>. </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../../db42-devel-4.2.52/api_cxx/db_class.html">Db</a> <h3>See Also</h3> <a href="../../db42-devel-4.2.52/api_cxx/db_list.html">Databases and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a><a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="../../db42-devel-4.2.52/sleepycat/legal.html">Copyright (c) 1996-2003</a> <a href="http://www.sleepycat.com">Sleepycat Software, Inc.</a> - All rights reserved.</font> </body> </html>
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