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WHERE	VARCHAR2(80)	This column is obsolete and maintained for backward compatibility.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
CON_ID	NUMBER	The ID of the container to which the data pertains. Possible values include: 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs. 1: This value is used for rows containing data that pertain to only the root n: Where n is the applicable container ID for the rows containing data