1. Database Reference
  2. Dynamic Performance Views
  3. Dynamic Performance (V$) Views: V$SCHEDULER_RUNNING_JOBS to V$ZONEMAP_USAGE_STATS
  4. V$SYSTEM_WAIT_CLASS

9.104 V$SYSTEM_WAIT_CLASS

V$SYSTEM_WAIT_CLASS displays the instance-wide time totals for each registered wait class.

Column Datatype Description

WAIT_CLASS_ID

NUMBER

Identifier of the wait class

WAIT_CLASS#

NUMBER

Number of the wait class

WAIT_CLASS

VARCHAR2(64)

Name of the wait class

TOTAL_WAITS

NUMBER

Total number of waits from this wait class

TIME_WAITED

NUMBER

Total amount of time spent in waits from this wait class (in hundredths of a second)

TOTAL_WAITS_FG

NUMBER

Total number of waits for this wait class, from foreground sessions

TIME_WAITED_FG

NUMBER

Total amount of time spent in waits from this wait class, from foreground sessions (in hundredths of a second)

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

Note:

This view returns instance-wide data and a value of 0 in the CON_ID column when queried from the root of a CDB.