Skip Headers

Oracle9i Database Reference
Release 2 (9.2)

Part Number A96536-02
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
Feedback

Go to previous page Go to next page
View PDF

V$LATCH_CHILDREN

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

Column Datatype Description

ADDR

RAW(4 | 8)

Address of the latch object

LATCH#

NUMBER

Latch number of the parent latch

CHILD#

NUMBER

Child latch number (unique only to each parent latch)

LEVEL#

NUMBER

Latch level

NAME

VARCHAR2(64)

Latch name

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

For some latches, the session releasing the latch posts a session waiting for the latch. This counts the number of times a waiting session was awakened.

WAITS_HOLDING_LATCH

NUMBER

Number of waits for the latch while the waiter was holding a different latch

SPIN_GETS

NUMBER

Willing-to-wait latch requests which missed the first try but succeeded while spinning

SLEEP[1 | 2 | 3]

NUMBER

Waits that slept 1 time through 3 times, respectively

SLEEP4

NUMBER

Waits that slept 4 or more times

SLEEP[5 | 6 | 7 | 8 | 9 | 10 | 11]

NUMBER

These columns are present 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)

See Also:

"V$LATCH"