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 of the snapshot
`INSTANCE_NUMBER`	`NUMBER`	`NOT NULL`	Instance number of the snapshot
`WAIT_CLASS_ID`	`NUMBER`	`NOT NULL`	Identifier of the class of the wait event
`WAIT_CLASS`	`VARCHAR2(64)`		Name of 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`	Percent of database time spent in the wait
`TIME_WAITED`	`NUMBER`	`NOT NULL`	Time waited during the interval (in microseconds)
`WAIT_COUNT`	`NUMBER`	`NOT NULL`	Number of times waited
`TIME_WAITED_FG`	`NUMBER`		Time waited (in hundredths of a second), from foreground sessions
`WAIT_COUNT_FG`	`NUMBER`		Number of times waited, from foreground sessions
`CON_DBID`	`NUMBER`		The database ID of the PDB for the sampled session
`CON_ID`	`NUMBER`		The ID of the container that `CON_DBID` identifies. 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