DBA_HIST_SYSTEM_EVENT

DBA_HIST_SYSTEM_EVENT displays historical information on total waits for an event. This view contains snapshots of V$SYSTEM_EVENT.

Column	Datatype	NULL	Description
`SNAP_ID`	`NUMBER`	`NOT NULL`	Unique snapshot ID
`DBID`	`NUMBER`	`NOT NULL`	Database ID for the snapshot
`INSTANCE_NUMBER`	`NUMBER`	`NOT NULL`	Instance number for the snapshot
`EVENT_ID`	`NUMBER`	`NOT NULL`	Identifier of the wait event
`EVENT_NAME`	`VARCHAR2(64)`	`NOT NULL`	Name of the wait event
`WAIT_CLASS_ID`	`NUMBER`		Identifier of the Class of the Wait Event
`WAIT_CLASS`	`VARCHAR2(64)`		Name of the Class 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_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_MICRO_FG`	`NUMBER`		Amount of time waited for the event (in microseconds), from foreground sessions