V$ENQUEUE_STATISTICS displays statistics on the number of enqueue (lock) requests for each type of lock. V$ENQUEUE_STATISTICS encompasses V$ENQUEUE_STAT and gives more detailed information (several rows for same enqueues with different reasons).
Name of the enqueue request
Type of enqueue requested
Reason for the enqueue request
Total number of enqueue requests or enqueue conversions for this type of enqueue
Total number of times an enqueue request or conversion resulted in a wait
Number of times an enqueue request or conversion was granted
Number of times an enqueue request or conversion failed
Total amount of time (in milliseconds) spent waiting for the enqueue or enqueue conversion
Description of the enqueue request
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