Berkeley DB: DbEnv.set_lk_max_locks
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++

# DbEnv.set_lk_max_locks |

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    import com.sleepycat.db.*;

    public void set_lk_max_locks(int max)
        throws DbException;

# Description

Set the maximum number of locks 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 locks. For specific information on configuring the size of the lock subsystem, see Configuring locking: sizing the system.

The DbEnv.set_lk_max_locks interface may be used only to configure Berkeley DB before the DbEnv.open interface is called.

The DbEnv.set_lk_max_locks method throws an exception that encapsulates a non-zero error value on failure.

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 DbEnv.set_lk_max_locks method may fail and throw an exception encapsulating a non-zero error for the following conditions:

EINVAL
  An invalid flag value or parameter was specified.

  Called after DbEnv.open was called.

The DbEnv.set_lk_max_locks method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the DbEnv.set_lk_max_locks method may fail and throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way.

# Class

DbEnv, DbLock

# See Also

DbEnv.set_lk_conflicts, DbEnv.set_lk_detect, DbEnv.set_lk_max_lockers, DbEnv.set_lk_max_locks, DbEnv.set_lk_max_objects, DbEnv.lock_detect, DbEnv.lock_get, DbEnv.lock_id, DbEnv.lock_id_free, DbEnv.lock_put, and DbEnv.lock_stat.`

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