DBA_HIST_ENQUEUE_STAT

DBA_HIST_ENQUEUE_STAT displays historical statistics on the number of enqueue (lock) requests for each type of lock. This view contains snapshots of V$ENQUEUE_STATISTICS.

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
`EQ_TYPE`	`VARCHAR2(2)`	`NOT NULL`	Type of enqueue requested
`REQ_REASON`	`VARCHAR2(64)`	`NOT NULL`	Reason for the enqueue request
`TOTAL_REQ#`	`NUMBER`		Total number of enqueue requests or enqueue conversions for this type of enqueue
`TOTAL_WAIT#`	`NUMBER`		Total number of times an enqueue request or conversion resulted in a wait
`SUCC_REQ#`	`NUMBER`		Number of times an enqueue request or conversion was granted
`FAILED_REQ#`	`NUMBER`		Number of times an enqueue request or conversion failed
`CUM_WAIT_TIME`	`NUMBER`		Total amount of time (in milliseconds) spent waiting for the enqueue or enqueue conversion
`EVENT#`	`NUMBER`		Event number
`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