V$WAITSTAT

V$WAITSTAT displays block contention statistics. This table is only updated when timed statistics are enabled.

Column	Datatype	Description
`CLASS`	`VARCHAR2(18)`	Class of the block
`COUNT`	`NUMBER`	Number of waits by this `OPERATION` for this `CLASS` of block
`TIME`	`NUMBER`	Sum of all wait times for all the waits by this `OPERATION` for this `CLASS` of block (in centiseconds)
`CON_ID`	`NUMBER`	The ID of the container to which the data pertains. 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