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Berkeley DB: DB_ENV->set_lk_max_locks
DB_ENV->set_lk_max_locks
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#include <db.h>
int
DB_ENV->set_lk_max_locks(DB_ENV *dbenv, u_int32_t max);
Description
Set the maximum number of locks supported by the Berkeley DB lock subsystem.
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 locks. For specific information on configuring the size of the lock
subsystem, see Configuring locking:
sizing the system.
The DB_ENV->set_lk_max_locks interface may be used only to configure Berkeley DB before
the DB_ENV->open interface is called.
The DB_ENV->set_lk_max_locks function returns a non-zero error value on failure and 0 on success.
The database environment's maximum number of locks may also be set 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_locks", one or more whitespace characters,
and the number of locks. Because the DB_CONFIG file is read when the database
environment is opened, it will silently overrule configuration done
before that time.
Errors
The DB_ENV->set_lk_max_locks function may fail and return a non-zero error for the following conditions:
- EINVAL
- An invalid flag value or parameter was specified.
Called after DB_ENV->open was called.
The DB_ENV->set_lk_max_locks function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
If a catastrophic error has occurred, the DB_ENV->set_lk_max_locks function may fail and return
DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail
in the same way.
See Also
DB_ENV->set_lk_conflicts,
DB_ENV->set_lk_detect,
DB_ENV->set_lk_max,
DB_ENV->set_lk_max_lockers,
DB_ENV->set_lk_max_locks,
DB_ENV->set_lk_max_objects,
lock_detect,
lock_get,
lock_id,
lock_put,
lock_stat,
and
lock_vec.
Copyright Sleepycat Software
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