#include <db.h>

int
DB_ENV->set_lk_max_lockers(DB_ENV *dbenv, u_int32_t max);

int
DB_ENV->get_lk_max_lockers(DB_ENV *dbenv, u_int32_t *lk_maxp);

Description: DB_ENV->set_lk_max_lockers

Set the maximum number of locking entities supported by the Berkeley DB environment. This value is used by DB_ENV->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 DB_ENV->set_lk_max_lockers method configures a database environment, not only operations performed using the specified DB_ENV handle.

The DB_ENV->set_lk_max_lockers method may not be called after the DB_ENV->open method is called. If the database environment already exists when DB_ENV->open is called, the information specified to DB_ENV->set_lk_max_lockers will be ignored.

The DB_ENV->set_lk_max_lockers method returns a non-zero error value on failure and 0 on success.

Parameters

max

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

Errors

The DB_ENV->set_lk_max_lockers method may fail and return one of the following non-zero errors:

EINVAL

If the method was called after DB_ENV->open was called; or if an invalid flag value or parameter was specified.

Description: DB_ENV->get_lk_max_lockers

The DB_ENV->get_lk_max_lockers method returns the maximum number of lockers.

The DB_ENV->get_lk_max_lockers method may be called at any time during the life of the application.

The DB_ENV->get_lk_max_lockers method returns a non-zero error value on failure and 0 on success.

Parameters

lk_maxp

The DB_ENV->get_lk_max_lockers method returns the maximum number of lockers in lk_maxp.

Class

See Also