DBA_HIST_LATCH_MISSES_SUMMARY

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`	`NOT NULL`	Unique snapshot ID
`DBID`	`NUMBER`	`NOT NULL`	Database ID for the snapshot
`INSTANCE_NUMBER`	`NUMBER`	`NOT NULL`	Instance number for the snapshot
`PARENT_NAME`	`VARCHAR2(50)`	`NOT NULL`	Latch name of a parent latch
`WHERE_IN_CODE`	`VARCHAR2(64)`	`NOT NULL`	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
`CON_DBID`	`NUMBER`		The database ID of the PDB for the sampled session
`CON_ID`	`NUMBER`		The ID of the container that `CON_DBID` identifies. 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