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Oracle® Database Reference
12c Release 1 (12.1)

E17615-24
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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 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


See Also:

"V$LATCH_MISSES"