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 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.正确答案ABD
