Skip Headers
Oracle® Database Reference
11g Release 2 (11.2)

Part Number E10820-03
Go to Documentation Home
Go to Book List
Book List
Go to Table of Contents
Go to Index
Go to Master Index
Master Index
Go to Feedback page
Contact Us

Go to previous page
Go to next page
View PDF


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   Unique snapshot ID
DBID NUMBER   Database ID for the snapshot
INSTANCE_NUMBER NUMBER   Instance number for the snapshot
LATCH_NAME VARCHAR2(64)   Latch name
CHILD# NUMBER   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 requestor 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 thse columns; they will always have a value of zero.
WAIT_TIME NUMBER   Elapsed time spent waiting for the latch (in microseconds)