DBA_HIST_WAITCLASSMET_HISTORY

DBA_HIST_WAITCLASSMET_HISTORY displays the history of the wait event class metric data kept by the Workload Repository.

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
`WAIT_CLASS_ID`	`NUMBER`	`NOT NULL`	Identifier for the class of the wait event
`WAIT_CLASS`	`VARCHAR2(64)`		Name for the class of the wait event
`BEGIN_TIME`	`DATE`	`NOT NULL`	Begin time of the interval
`END_TIME`	`DATE`	`NOT NULL`	End time of the interval
`INTSIZE`	`NUMBER`	`NOT NULL`	Interval size (in hundredths of a second)
`GROUP_ID`	`NUMBER`	`NOT NULL`	Metric group ID
`AVERAGE_WAITER_COUNT`	`NUMBER`	`NOT NULL`	Average waiter count
`DBTIME_IN_WAIT`	`NUMBER`	`NOT NULL`	Database time spent in the wait
`TIME_WAITED`	`NUMBER`	`NOT NULL`	Time waited during this interval
`WAIT_COUNT`	`NUMBER`	`NOT NULL`	Number of times waited