Set the maximum number of simultaneously locked objects supported by
the Berkeley DB lock subsystem. 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 objects. For specific
information on configuring the size of the lock subsystem, see
Configuring locking: sizing the
The DbEnv::set_lk_max_objects method configures a database environment, not only operations
performed using the specified DbEnv handle.
The DbEnv::set_lk_max_objects interface may not be called after the DbEnv::open
interface is called.
If the database environment already exists when
DbEnv::open is called, the information specified to DbEnv::set_lk_max_objects
will be ignored.
The DbEnv::set_lk_max_objects 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 database environment's maximum number of objects 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_objects", one or more whitespace characters,
and the number of objects. 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_objects method may fail and throw an exception or return a non-zero error for the following conditions:
- An invalid flag value or parameter was specified.
Called after DbEnv::open was called.
The DbEnv::set_lk_max_objects 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.
If a catastrophic error has occurred, the DbEnv::set_lk_max_objects method may fail and
either return DB_RUNRECOVERY or throw a
in which case all subsequent Berkeley DB calls will fail in the same way.
Locking Subsystem and Related Methods
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