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<title>Berkeley DB: DbEnv::set_lk_max</title>
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<h1>DbEnv::set_lk_max</h1>
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#include <db_cxx.h>
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DbEnv::set_lk_max(u_int32_t max);
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<p><b>The DbEnv::set_lk_max method interface has been deprecated in favor of
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the <a href="../api_cxx/env_set_lk_max_locks.html">DbEnv::set_lk_max_locks</a>, <a href="../api_cxx/env_set_lk_max_lockers.html">DbEnv::set_lk_max_lockers</a>,
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and <a href="../api_cxx/env_set_lk_max_objects.html">DbEnv::set_lk_max_objects</a> methods. Please update your applications.</b>
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<p>Set each of the maximum number of locks, lockers, and lock objects
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supported by the Berkeley DB lock subsystem to <b>max</b>. This value is
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used by <a href="../api_cxx/env_open.html">DbEnv::open</a> to estimate how much space to allocate for
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various lock-table data structures. For specific information on
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configuring the size of the lock subsystem, see
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<a href="../ref/lock/max.html">Configuring locking: sizing the
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<p>The DbEnv::set_lk_max interface may be used only to configure Berkeley DB before
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the <a href="../api_cxx/env_open.html">DbEnv::open</a> interface is called.
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<p>The DbEnv::set_lk_max method either returns a non-zero error value or throws an exception that
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encapsulates a non-zero error value on failure, and returns 0 on success.
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<p>The database environment's maximum number of locks may also be set using the environment's
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<b>DB_CONFIG</b> file. The syntax of the entry in that file is a
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single line with the string "set_lk_max", one or more whitespace characters,
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and the number of locks. Because the <b>DB_CONFIG</b> file is read when the database
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environment is opened, it will silently overrule configuration done
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<p>The DbEnv::set_lk_max method may fail and throw an exception or return a non-zero error for the following conditions:
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<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
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<p>Called after <a href="../api_cxx/env_open.html">DbEnv::open</a> was called.
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<p>The DbEnv::set_lk_max 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.
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If a catastrophic error has occurred, the DbEnv::set_lk_max method may fail and either
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return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw an exception encapsulating
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<a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>, in which case all subsequent Berkeley DB calls will fail
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<a href="../api_cxx/dbenv_class.html">DbEnv</a>, <a href="../api_cxx/lock_class.html">DbLock</a>
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<a href="../api_cxx/env_set_lk_conflicts.html">DbEnv::set_lk_conflicts</a>,
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<a href="../api_cxx/env_set_lk_detect.html">DbEnv::set_lk_detect</a>,
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<a href="../api_cxx/env_set_lk_max.html">DbEnv::set_lk_max</a>,
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<a href="../api_cxx/env_set_lk_max_lockers.html">DbEnv::set_lk_max_lockers</a>,
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<a href="../api_cxx/env_set_lk_max_locks.html">DbEnv::set_lk_max_locks</a>,
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<a href="../api_cxx/env_set_lk_max_objects.html">DbEnv::set_lk_max_objects</a>,
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<a href="../api_cxx/lock_detect.html">DbEnv::lock_detect</a>,
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<a href="../api_cxx/lock_get.html">DbEnv::lock_get</a>,
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<a href="../api_cxx/lock_id.html">DbEnv::lock_id</a>,
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<a href="../api_cxx/lock_put.html">DbLock::put</a>,
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<a href="../api_cxx/lock_stat.html">DbEnv::lock_stat</a>,
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<a href="../api_cxx/lock_vec.html">DbEnv::lock_vec</a>.
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