DbEnv.lock_stat

import com.sleepycat.db.*; public DbLockStat lock_stat(int flags) throws DbException; Description The DbEnv.lock_stat method returns the locking subsystem statistics. The flags value must be set to 0 or the following value: Db.DB_STAT_CLEAR Reset statistics after returning their values. The DbEnv.lock_stat method creates a DbLockStat object encapsulating the lock region statistics. The following data fields are available from the DbLockStat object: public int st_id; The last allocated locker ID. public int st_cur_maxid; The current maximum unused locker 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 lock 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 lock objects. public int st_maxnobjects; The maximum number of lock 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 failing 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. public int st_locktimeout; Lock timeout value. public int st_nlocktimeouts; The number of locks that have timed out. public int st_txntimeout; Transaction timeout value. public int st_ntxntimeouts; The number of transactions that have timed out. This value is also a component of st_ndeadlocks, the total number of deadlocks detected. public int st_regsize; The size of the lock 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 DbEnv, DbLock See Also Locking Subsystem and Related Methods