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 |