V$LATCH_MISSES

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`WHERE`	`VARCHAR2(80)`	This column is obsolete and maintained for backward compatibility.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