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Oracle® Database Reference 10g Release 2 (10.2) Part Number B14237-02 |
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# 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` |  | 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