Which three are true about Automatic Workload Repository (AWR)?
(Choose three.)
A.By default, AWR snapshots are taken every 60 minutes. B.Its collection level is determined by the value of the STATISTICS_LEVEL正确答案ABD
Database parameter. C.By default, AWR snapshots are retained for 7 days. D.The taking of AWR snapshots can be disabled. E.AWR data is stored in the SYSTEM tablespace.