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<title>Berkeley DB: DbEnv::set_lk_max_lockers</title>
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<h1>DbEnv::set_lk_max_lockers</h1>
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<h3><pre>
#include <db_cxx.h>
<p>
int
DbEnv::set_lk_max_lockers(u_int32_t max);
</pre></h3>
<h1>Description</h1>
<p>Set the maximum number of simultaneous locking entities supported by
the Berkeley DB lock subsystem. 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 lockers. 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>The DbEnv::set_lk_max_lockers method configures a database environment, not only operations
performed using the specified <a href="../api_cxx/env_class.html">DbEnv</a> handle.
<p>The DbEnv::set_lk_max_lockers interface may not be called after the <a href="../api_cxx/env_open.html">DbEnv::open</a>
interface 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_lockers
will be ignored.
<p>The DbEnv::set_lk_max_lockers 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>The database environment's maximum number of lockers 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_lockers", one or more whitespace characters,
and the number of lockers. Because the <b>DB_CONFIG</b> file is read when the database
environment is opened, it will silently overrule configuration done
before that time.
<h1>Errors</h1>
<p>The DbEnv::set_lk_max_lockers method may fail and throw an exception or return a non-zero error for the following conditions:
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
<p>Called after <a href="../api_cxx/env_open.html">DbEnv::open</a> was called.
</dl>
<p>The DbEnv::set_lk_max_lockers method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbEnv::set_lk_max_lockers method may fail and
either return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw a
<a href="../api_cxx/runrec_class.html">DbRunRecoveryException</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/lock_class.html">DbLock</a>
<h1>See Also</h1>
<a href="../api_cxx/lock_list.html">Locking Subsystem and Related Methods</a>
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