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

9.99 V$SYSTEM_EVENT

V$SYSTEM_EVENT displays information on total waits for an event. Note that the TIME_WAITED and AVERAGE_WAIT columns will contain a value of zero on those platforms that do not support a fast timing mechanism. If you are running on one of these platforms and you want this column to reflect true wait times, then you must set TIMED_STATISTICS to TRUE in the parameter file; doing this will have a small negative effect on system performance.

See Also:

"TIMED_STATISTICS"

Column Datatype Description

EVENT

VARCHAR2(64)

Name of the wait event

TOTAL_WAITS

NUMBER

Total number of waits for the event

TOTAL_TIMEOUTS

NUMBER

Total number of timeouts for the event

TIME_WAITED

NUMBER

Total amount of time waited for the event (in hundredths of a second)

AVERAGE_WAIT

NUMBER

Average amount of time waited for the event (in hundredths of a second)

TIME_WAITED_MICRO

NUMBER

Total amount of time waited for the event (in microseconds)

TOTAL_WAITS_FG

NUMBER

Total number of waits for the event, from foreground sessions

TOTAL_TIMEOUTS_FG

NUMBER

Total number of timeouts for the event, from foreground sessions

TIME_WAITED_FG

NUMBER

Amount of time waited for the event (in hundredths of a second), from foreground sessions

AVERAGE_WAIT_FG

NUMBER

Average amount of time waited for the event (in hundredths of a second), from foreground sessions

TIME_WAITED_MICRO_FG

NUMBER

Amount of time waited for the event (in microseconds), from foreground sessions

EVENT_ID

NUMBER

Identifier of the wait event

WAIT_CLASS_ID

NUMBER

Identifier of the class of the wait event

WAIT_CLASS#

NUMBER

Number of the class of the wait event

WAIT_CLASS

VARCHAR2(64)

Name of the class of the wait event

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.