Skip Headers
Oracle® Database Reference
11g Release 1 (11.1)

Part Number B28320-01
Go to Documentation Home
Home
Go to Book List
Book List
Go to Table of Contents
Contents
Go to Index
Index
Go to Master Index
Master Index
Go to Feedback page
Contact Us

Go to previous page
Previous
Go to next page
Next
View PDF

V$LATCH

V$LATCH displays aggregate latch statistics for both parent and child latches, grouped by latch name. Individual parent and child latch statistics are broken down in the views V$LATCH_PARENT and V$LATCH_CHILDREN.

Column Datatype Description
ADDR RAW(4 | 8) Address of the latch object
LATCH# NUMBER Latch number
LEVEL# NUMBER Latch level
NAME VARCHAR2(64) Latch name
HASH NUMBER Latch hash
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)
WAITERS_WOKEN NUMBER This column has been deprecated and is present only for compatibility with previous releases of Oracle. No data is accumulated for this column; it will always have a value of zero.
WAITS_HOLDING_LATCH NUMBER This column has been deprecated and is present only for compatibility with previous releases of Oracle. No data is accumulated for this column; it will always have a value of zero.
SPIN_GETS NUMBER 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. As a substitute for this column you can query the appropriate rows of the V$EVENT_HISTOGRAM view where the EVENT column has a value of latch free or latch:%.
SLEEP[5 | 6 | 7 | 8 | 9 | 10 | 11] NUMBER These columns have been deprecated and are present only for compatibility with previous releases of Oracle. No data is accumulated for these columns.
WAIT_TIME NUMBER Elapsed time spent waiting for the latch (in microseconds)