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 |