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Which three statements are true about Automatic Workload Repository (AWR)?（）
A:All AWR tables belong to the SYSTEM schema.
B:The AWR data is stored in memory and in the database.
C:The snapshots collected by AWR are used by the self-tuning components in the database
D:AWR computes time model statistics based on time usage for activities, which are displayed in the v$SYS time model and V$SESS_TIME_MODEL views.
E:AWR contains system wide tracing and logging information.

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出自：Oracle认证

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