1. Database Reference
  2. Dynamic Performance Views
  3. Dynamic Performance (V$) Views: V$IM_COLUMN_LEVEL to V$RULE_SET_AGGREGATE_STATS
  4. V$LATCH_MISSES

8.29 V$LATCH_MISSES

V$LATCH_MISSES displays statistics about missed attempts to acquire a latch.

Column Datatype Description

PARENT_NAME

VARCHAR2(64)

Latch name of a parent latch

WHERE

VARCHAR2(80)

This column is obsolete and maintained for backward compatibility. The value of this column is always equal to the value in LOCATION.

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

LONGHOLD_COUNT

NUMBER

Number of times someone held a latch for the entire duration of someone else's sleep

LOCATION

VARCHAR2(80)

Location that attempted to acquire the latch

CON_ID

NUMBER

The ID of the container to which the data pertains. 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