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Oracle® Database Reference
12c Release 1 (12.1)

E17615-24
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DBA_HIST_LATCH_CHILDREN

DBA_HIST_LATCH_CHILDREN displays historical statistics about child latches. This view includes all columns of DBA_HIST_LATCH plus the CHILD# column. Note that child latches have the same parent if their LATCH# columns match each other. This view contains snapshots of V$LATCH_CHILDREN.

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
LATCH_HASH NUMBER NOT NULL Latch hash
LATCH_NAME VARCHAR2(64) NOT NULL Latch name
CHILD# NUMBER NOT NULL Child latch number (unique only to each parent latch)
GETS NUMBER   Number of times the latch was requested in willing-to-wait mode
MISSES NUMBER   Number of times the latch was requested in willing-to-wait mode and the requester had to wait
SLEEPS NUMBER   Number of times a willing-to-wait latch request resulted in a session sleeping while waiting for the latch
IMMEDIATE_GETS NUMBER   Number of times a latch was requested in no-wait mode
IMMEDIATE_MISSES NUMBER   Number of times a no-wait latch request did not succeed (that is, missed)
SPIN_GETS NUMBER   Number of willing-to-wait latch requests which missed the first try but succeeded while spinning
SLEEP[1 | 2 | 3 | 4] NUMBER   These columns have been deprecated and are present only for compatibility with previous releases of Oracle. No data is accumulated for these columns; they will always have a value of zero.
WAIT_TIME NUMBER   Elapsed time spent waiting for the latch (in microseconds)
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