<{p}>23、Which two are true about Optimizer Statistics?<{/p}>

发布于 2021-04-23 20:02:27
【多选题】
A They are ignored by Optimizer if they are stale.
B They provide real-time data about schema objects
C By default, they are automatically gathered by a maintenance job
D They are gathered by the SQL Tuning Advisor
E They can be gathered by the DBMS_STATS package

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