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V$LATCH_MISSES displays statistics about missed attempts to acquire a latch.

Column Datatype Description
PARENT_NAME VARCHAR2(64) Latch name of a parent latch
WHERE VARCHAR2(80) This column is obsolete and maintained for backward compatibility. The value of this column is always equal to the value in LOCATION.
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
LONGHOLD_COUNT NUMBER Number of times someone held a latch for the entire duration of someone else's sleep
LOCATION VARCHAR2(80) Location that attempted to acquire the latch