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Database Administration
Reference : Virtual System Tables : Virtual system table summaries : Latch statistics (_Latch)
 
Latch statistics (_Latch)
The _Latch VST displays statistics on latch and latch queue activity.
Field name
Data type
Description
_Latch-Busy
INT64
Latch busy count
_Latch-Hold
INTEGER
User number of the last latch holder
_Latch-HoldTenantId
INTEGER
Tenant ID for the user holding the latch
_Latch-Lock
INT64
Latch lock count
_Latch-LockedT
INTEGER
Used for calculation of duration of lock
_Latch-LockT
INTEGER
Number, in microseconds, the latch was locked
_Latch-Name
CHARACTER
Latch name
_Latch-Owner
INTEGER
User number of the latch owner.
_Latch-Qhold
INTEGER
User number of the last queue holder
_LatchQHoldTenantId
INTEGER
Tenant ID for the last queue holder
_Latch-Spin
INTEGER
Latch spin count
_Latch-Type
CHARACTER
Latch type
_Latch-Wait
INT64
Latch wait (nap) count
_Latch-WaitT
INTEGER
Number, in microseconds, of wait or spin time