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Oracle® Database Reference
11g Release 1 (11.1)

Part Number B28320-01
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DBA_HIST_LATCH_MISSES_SUMMARY displays historical summary statistics about missed attempts to acquire a latch. This view contains snapshots of V$LATCH_MISSES.

Column Datatype NULL Description
SNAP_ID NUMBER   Unique snapshot ID
DBID NUMBER   Database ID for the snapshot
INSTANCE_NUMBER NUMBER   Instance number for the snapshot
PARENT_NAME VARCHAR2(50)   Latch name of a parent latch
WHERE_IN_CODE VARCHAR2(64)   Location that attempted to acquire the latch
NWFAIL_COUNT NUMBER   Number of times that no-wait acquisition of the latch failed
SLEEP_COUNT NUMBER   Number of times that acquisition attempts caused sleeps
WTR_SLP_COUNT NUMBER   Number of times a waiter slept