Edit File: env_set_lk_max_locks.html
<!--$Id: env_set_lk_max_locks.so,v 10.23 2004/09/28 15:04:20 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DB_ENV->set_lk_max_locks</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> <b>DB_ENV->set_lk_max_locks</b> </td> <td align=right> <a href="../../db4-devel-4.7.25/api_c/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a> <a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <b><pre> #include <db.h> <p> int DB_ENV->set_lk_max_locks(DB_ENV *dbenv, u_int32_t max); <p> int DB_ENV->get_lk_max_locks(DB_ENV *dbenv, u_int32_t *lk_maxp); </pre></b> <hr size=1 noshade> <b>Description: DB_ENV->set_lk_max_locks</b> <p>Set the maximum number of locks supported by the Berkeley DB environment. This value is used by <a href="../../db4-devel-4.7.25/api_c/env_open.html">DB_ENV->open</a> to estimate how much space to allocate for various lock-table data structures. The default value is 1000 locks. For specific information on configuring the size of the lock subsystem, see <a href="../../db4-devel-4.7.25/ref/lock/max.html">Configuring locking: sizing the system</a>.</p> <p>The database environment's maximum number of locks may also be configured using the environment's <a href="../../db4-devel-4.7.25/ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file. The syntax of the entry in that file is a single line with the string "set_lk_max_locks", one or more whitespace characters, and the number of locks. Because the <a href="../../db4-devel-4.7.25/ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file is read when the database environment is opened, it will silently overrule configuration done before that time.</p> <p>The DB_ENV->set_lk_max_locks method configures a database environment, not only operations performed using the specified <a href="../../db4-devel-4.7.25/api_c/env_class.html">DB_ENV</a> handle.</p> <p>The DB_ENV->set_lk_max_locks method may not be called after the <a href="../../db4-devel-4.7.25/api_c/env_open.html">DB_ENV->open</a> method is called. If the database environment already exists when <a href="../../db4-devel-4.7.25/api_c/env_open.html">DB_ENV->open</a> is called, the information specified to DB_ENV->set_lk_max_locks will be ignored. </p> <p>The DB_ENV->set_lk_max_locks method returns a non-zero error value on failure and 0 on success. </p> <b>Parameters</b> <br> <b>max</b><ul compact><li>The <b>max</b> parameter is the maximum number of locks supported by the Berkeley DB environment.</ul> <br> <br><b>Errors</b> <p>The DB_ENV->set_lk_max_locks method may fail and return one of the following non-zero errors:</p> <br> <b>EINVAL</b><ul compact><li>If the method was called after <a href="../../db4-devel-4.7.25/api_c/env_open.html">DB_ENV->open</a> was called; or if an invalid flag value or parameter was specified.</ul> <br> <hr size=1 noshade> <b>Description: DB_ENV->get_lk_max_locks</b> <p>The DB_ENV->get_lk_max_locks method returns the maximum number of locks.</p> <p>The DB_ENV->get_lk_max_locks method may be called at any time during the life of the application.</p> <p>The DB_ENV->get_lk_max_locks method returns a non-zero error value on failure and 0 on success. </p> <b>Parameters</b> <br> <b>lk_maxp</b><ul compact><li>The DB_ENV->get_lk_max_locks method returns the maximum number of locks in <b>lk_maxp</b>.</ul> <br> <hr size=1 noshade> <br><b>Class</b> <a href="../../db4-devel-4.7.25/api_c/env_class.html">DB_ENV</a>, <a href="../../db4-devel-4.7.25/api_c/lock_class.html">DB_LOCK</a> <br><b>See Also</b> <a href="../../db4-devel-4.7.25/api_c/lock_list.html">Locking Subsystem and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db4-devel-4.7.25/api_c/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a><a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>
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