DB_ENV->set_lk_max_lockers(DB_ENV *dbenv, u_int32_t max);
Set the maximum number of simultaneous locking entities 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 lockers. For specific
information on configuring the size of the lock subsystem, see
Configuring locking: sizing the
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 interface may not be called after the DB_ENV->open
interface 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.
The database environment's maximum number of lockers 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_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 may fail and return a non-zero error for the following conditions:
- An invalid flag value or parameter was specified.
Called after DB_ENV->open was called.
The DB_ENV->set_lk_max_lockers method 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_lockers method may fail and
in which case all subsequent Berkeley DB calls will fail in the same way.
Locking Subsystem and Related Methods
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