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<!--$Id: env_set_lk_max_objects.so,v 1.23 2004/09/28 15:04:20 bostic Exp $-->
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<title>Berkeley DB: DbEnv::set_lk_max_objects</title>
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<h3>DbEnv::set_lk_max_objects</h3>
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<h3><pre>
#include <db_cxx.h>
<p>
int
DbEnv::set_lk_max_objects(u_int32_t max);
<p>
int
DbEnv::get_lk_max_objects(u_int32_t *lk_maxp);
</pre></h3>
<hr size=1 noshade>
<h3>Description: DbEnv::set_lk_max_objects</h3>
<p>Set the maximum number of locked objects supported by the Berkeley DB
environment. This value is used by <a href="../api_cxx/env_open.html">DbEnv::open</a> to estimate how
much space to allocate for various lock-table data structures. The
default value is 1000 objects. For specific information on configuring
the size of the lock subsystem, see <a href="../ref/lock/max.html">Configuring locking: sizing the system</a>.</p>
<p>The database environment's maximum number of objects may also be set using the environment's
<b>DB_CONFIG</b> file. The syntax of the entry in that file is a
single line with the string "set_lk_max_objects", one or more whitespace characters,
and the number of objects.
Because the <b>DB_CONFIG</b> file is read when the database
environment is opened, it will silently overrule configuration done
before that time.</p>
<p>The DbEnv::set_lk_max_objects method configures a database environment, not only operations
performed using the specified <a href="../api_cxx/env_class.html">DbEnv</a> handle.</p>
<p>The DbEnv::set_lk_max_objects method may not be called after the <a href="../api_cxx/env_open.html">DbEnv::open</a> method is
called.
If the database environment already exists when
<a href="../api_cxx/env_open.html">DbEnv::open</a> is called, the information specified to DbEnv::set_lk_max_objects
will be ignored.
</p>
<p>The DbEnv::set_lk_max_objects 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>
<dl compact>
<dt><b>max</b><dd>The <b>max</b> parameter is the maximum number of locked objects
supported by the Berkeley DB environment.
</dl>
<h3>Errors</h3>
<p>The DbEnv::set_lk_max_objects 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>
<dl compact>
<dt>EINVAL<dd>If the method was called after <a href="../api_cxx/env_open.html">DbEnv::open</a> was called; or if an
invalid flag value or parameter was specified.
</dl>
<hr size=1 noshade>
<h3>Description: DbEnv::get_lk_max_objects</h3>
<p>The DbEnv::get_lk_max_objects method returns the maximum number of locked objects.</p>
<p>The DbEnv::get_lk_max_objects method may be called at any time during the life of the
application.</p>
<p>The DbEnv::get_lk_max_objects 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>
<dl compact>
<dt><b>lk_maxp</b><dd>The DbEnv::get_lk_max_objects method returns the
maximum number of locked objects in <b>lk_maxp</b>.
</dl>
<hr size=1 noshade>
<h3>Class</h3>
<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/lock_class.html">DbLock</a>
<h3>See Also</h3>
<a href="../api_cxx/lock_list.html">Locking Subsystem and Related Methods</a>
</tt>
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