import com.sleepycat.db.*;

public DbLockStat lock_stat()
	throws DbException;

Description

The DbEnv.lock_stat method creates a DbLockStat object encapsulating a statistical structure. The lock region statistics are stored in a DbLockStat object. The following data fields are available from the DbLockStat object:

The lock region statistics are stored in a structure of type DB_LOCK_STAT. The following DB_LOCK_STAT fields will be filled in:

public int st_lastid;

The last allocated lock ID.

public int st_nmodes;

The number of lock modes.

public int st_maxlocks;

The maximum number of locks possible.

public int st_maxlockers;

The maximum number of lockers possible.

public int st_maxobjects;

The maximum number of objects possible.

public int st_nlocks;

The number of current locks.

public int st_maxnlocks;

The maximum number of locks at any one time.

public int st_nlockers;

The number of current lockers.

public int st_maxnlockers;

The maximum number of lockers at any one time.

public int st_nobjects;

The number of current objects.

public int st_maxnobjects;

The maximum number of objects at any one time.

public int st_nrequests;

The total number of locks requested.

public int st_nreleases;

The total number of locks released.

public int st_nnowaits;

The total number of lock requests that failed because Db.DB_LOCK_NOWAIT was set.

public int st_nconflicts;

The total number of locks not immediately available due to conflicts.

public int st_ndeadlocks;

The number of deadlocks detected.

public int st_regsize;

The size of the region.

public int st_region_wait;

The number of times that a thread of control was forced to wait before obtaining the region lock.

public int st_region_nowait;

The number of times that a thread of control was able to obtain the region lock without waiting.

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

Errors

The DbEnv.lock_stat 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.lock_stat method may fail and throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way.

Class

See Also