<!--$Id: memp_maxwrite.so,v 10.5 2006/11/29 21:37:17 bostic Exp $--> <!--Copyright (c) 1997,2007 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DB_ENV->set_mp_max_write</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++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td> <h3>DB_ENV->set_mp_max_write</h3> </td> <td align=right> <a href="../../db46-devel-4.6.21/api_c/api_core.html"><img src="../../db46-devel-4.6.21/images/api.gif" alt="API"></a> <a href="../../db46-devel-4.6.21/ref/toc.html"><img src="../../db46-devel-4.6.21/images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db.h> <p> int DB_ENV->set_mp_max_write(DB_ENV *env, int maxwrite, db_timeout_t maxwrite_sleep); <p> int DB_ENV->get_mp_max_write(DB_ENV *env, int *maxwritep, db_timeout_t *maxwrite_sleepp); </pre></h3> <hr size=1 noshade> <h3>Description: DB_ENV->set_mp_max_write</h3> <p>The DB_ENV->set_mp_max_write method limits the number of sequential write operations scheduled by the library when flushing dirty pages from the cache.</p> <p>The DB_ENV->set_mp_max_write method returns a non-zero error value on failure and 0 on success. </p> <h3>Parameters</h3> <dl compact> <dt><b>maxwrite</b><dd>The maximum number of sequential write operations scheduled by the library when flushing dirty pages from the cache, or 0 if there is no limitation on the number of sequential write operations. <dt><b>maxwrite_sleep</b><dd>The number of microseconds the thread of control should pause before scheduling further write operations. It must be specified as an unsigned 32-bit number of microseconds, limiting the maximum pause to roughly 71 minutes. </dl> <h3>Errors</h3> <p>The DB_ENV->set_mp_max_write method may fail and return one of the following non-zero errors:</p> <dl compact> <dt>EINVAL<dd>An invalid flag value or parameter was specified. </dl> <hr size=1 noshade> <h3>Description: DB_ENV->get_mp_max_write</h3> <p>The DB_ENV->get_mp_max_write method returns the current maximum number of sequential write operations and microseconds to pause.</p> <p>The DB_ENV->get_mp_max_write method may be called at any time during the life of the application.</p> <p>The DB_ENV->get_mp_max_write method returns a non-zero error value on failure and 0 on success. </p> <h3>Parameters</h3> <dl compact> <dt><b>maxwritep</b><dd>The <b>maxwritep</b> parameter references memory into which the maximum number of sequential write operations is copied. <dt><b>maxwrite_sleepp</b><dd>The <b>maxwrite_sleepp</b> parameter references memory into which the microseconds to pause before scheduling further write operations is copied. </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../../db46-devel-4.6.21/api_c/env_class.html">DB_ENV</a>, <a href="../../db46-devel-4.6.21/api_c/mempfile_class.html">DB_MPOOLFILE</a> <h3>See Also</h3> <a href="../../db46-devel-4.6.21/api_c/memp_list.html">Memory Pools and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db46-devel-4.6.21/api_c/api_core.html"><img src="../../db46-devel-4.6.21/images/api.gif" alt="API"></a><a href="../../db46-devel-4.6.21/ref/toc.html"><img src="../../db46-devel-4.6.21/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2007 Oracle. All rights reserved.</font> </body> </html>
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