053(四）

16.Because of a logical corruption in your production database, you wanted to perform Tablespace Point in Time Recovery (TSPITR).
But before you start the recovery, you queried the TS_PITR_OBJECTS_TO_BE_DROPPED view and realized that there are a large number of objects that would be dropped when you start the recovery by using this method. You want to preserve these objects.
Which option must you use to perform TSPITR and preserve the object?
A. Perform Export before TSPITR and Import after TSPITR
B. Move objects to another schema that has the same tablespace assigned
C. Perform Incomplete Recovery before TSPITR with the Log Sequence Number (LSN)
D. Perform Incomplete Recovery before TSPITR with the System Change Number (SCN)

Answer: BC

参考：Reference
V$RSRC_CONSUMER_GROUP

ACTIVE_SESSIONS
Number of currently active sessions in the consumer group

QUEUE_LENGTH
Number of sessions waiting in the queue

CPU_WAIT_TIME
Cumulative amount of time that sessions waited for CPU because of resource management.
This does not include waits due to latch or enqueue contention, I/O waits, and so on.c