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Berkeley DB: DbEnv.lock_stat
DbEnv.lock_stat
|
 
|
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
DbEnv, DbLock
See Also
DbEnv.set_lk_conflicts,
DbEnv.set_lk_detect,
DbEnv.set_lk_max,
DbEnv.set_lk_max_lockers,
DbEnv.set_lk_max_locks,
DbEnv.set_lk_max_objects,
DbEnv.lock_detect,
DbEnv.lock_get,
DbEnv.lock_id,
DbLock.put,
and
DbEnv.lock_stat.
Copyright Sleepycat Software
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public DbLockStat lock_stat(int flags)
throws DbException;
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The flags value must be set to 0 or
the following value:
- Db.DB_STAT_CLEAR
- Reset statistics after returning their values.
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public int st_nlocktimeouts;The number of locks that have timed out.
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.
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DbEnv.lock_id_free,
DbEnv.lock_put,
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The DbEnv.lock_stat method returns the locking subsystem statistics.
d37 2
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The DbEnv.lock_stat method creates a DbLockStat object encapsulating the
lock region statistics. The following data fields are available from
the DbLockStat object:
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public int st_id;The last allocated locker ID.
public int st_cur_maxid;The current maximum unused locker ID.
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public int st_maxobjects;The maximum number of lock objects possible.
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public int st_nobjects;The number of current lock objects.
public int st_maxnobjects;The maximum number of lock objects at any one time.
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public int st_nnowaits;The total number of lock requests failing because
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public int st_ndeadlocks;The number of deadlocks.
public int st_locktimeout;Lock timeout value.
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public int st_txntimeout;Transaction timeout value.
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public int st_regsize;The size of the lock region.
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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.
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DbEnv, DbLock
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Locking Subsystem and Related Methods
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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:
d35 3
a37 2
The lock region statistics are stored in a structure of type
DB_LOCK_STAT. The following DB_LOCK_STAT fields will be filled in:
d39 2
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public int st_lastid;The last allocated lock ID.
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public int st_maxobjects;The maximum number of objects possible.
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public int st_nobjects;The number of current objects.
public int st_maxnobjects;The maximum number of objects at any one time.
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public int st_nnowaits;The total number of lock requests that failed because
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public int st_ndeadlocks;The number of deadlocks detected.
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public int st_regsize;The size of the region.
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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.
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a77 1
DbEnv, DbLock
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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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1.1.1.5
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The DbEnv.lock_stat method returns the locking subsystem statistics.
d37 2
a38 3
The DbEnv.lock_stat method creates a DbLockStat object encapsulating the
lock region statistics. The following data fields are available from
the DbLockStat object:
d40 1
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public int st_id;The last allocated locker ID.
public int st_cur_maxid;The current maximum unused locker ID.
d44 1
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public int st_maxobjects;The maximum number of lock objects possible.
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a50 2
public int st_nobjects;The number of current lock objects.
public int st_maxnobjects;The maximum number of lock objects at any one time.
d53 1
a53 1
public int st_nnowaits;The total number of lock requests failing because
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public int st_ndeadlocks;The number of deadlocks.
public int st_locktimeout;Lock timeout value.
a57 1
public int st_txntimeout;Transaction timeout value.
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public int st_regsize;The size of the lock region.
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a73 3
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.
d75 1
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DbEnv, DbLock
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a88 1
Locking Subsystem and Related Methods
@