#include <db_cxx.h>

DbEnv::set_lk_max_lockers(u_int32_t max); 

This method is deprecated. Instead, use DbEnv::set_memory_init(), DbEnv::set_memory_max(), and DbEnv::set_lk_tablesize().

Sets the maximum number of locking entities supported by the Berkeley DB environment. This value is used by DbEnv::open() 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 Configuring locking: sizing the system.

The database environment's maximum number of lockers may also be configured using the environment's DB_CONFIG 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 DB_CONFIG file is read when the database environment is opened, it will silently overrule configuration done before that time.

The DbEnv::set_lk_max_lockers() method configures a database environment, not only operations performed using the specified DbEnv handle.

The DbEnv::set_lk_max_lockers() method may not be called after the DbEnv::open() method is called. If the database environment already exists when DbEnv::open() is called, the information specified to DbEnv::set_lk_max_lockers() will be ignored.

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.



The max parameter is the maximum number simultaneous locking entities supported by the Berkeley DB environment.


The DbEnv::set_lk_max_lockers() method may fail and throw a DbException exception, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:


If the method was called after DbEnv::open() was called; or if an invalid flag value or parameter was specified.


DbEnv, DbLock

See Also

Locking Subsystem and Related Methods