DBA_HIST_EVENT_HISTOGRAM

DBA_HIST_EVENT_HISTOGRAM displays event histogram historical statistics information. This view contains snapshots of V$EVENT_HISTOGRAM.

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
`WAIT_TIME_MILLI`	`NUMBER`	`NOT NULL`	Wait time (in milliseconds)
`WAIT_COUNT`	`NUMBER`		Wait count