DBA_HIST_WAITSTAT

DBA_HIST_WAITSTAT displays historical block contention statistics. This view contains snapshots of V$WAITSTAT.

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
`CLASS`	`VARCHAR2(18)`	`NOT NULL`	Class of the block
`WAIT_COUNT`	`NUMBER`		Number of waits by the OPERATION for this CLASS of block
`TIME`	`NUMBER`		Sum of all wait times for all the waits by the OPERATION for this CLASS of block
`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