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Examine the parameters for your database instance: Which three statements are true about the process of automatic optimization by using cardinality feedback?（）
- A、The optimizer automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics.
- B、The optimizer can re optimize a query only once using cardinality feedback.
- C、The optimizer enables monitoring for cardinality feedback after the first execution of a query.
- D、The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
- E、After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.
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更多 “ Examine the parameters for your database instance: Which three statements are true about the process of automatic optimization by using cardinality feedback?（）A、The optimizer automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics.B、The optimizer can re optimize a query only once using cardinality feedback.C、The optimizer enables monitoring for cardinality feedback after the first execution of a query.D、The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.E、After the optimizer identifies a query as a re-optimization candidate, statistics collected by thecollectors are submitted to the optimizer.” 相关考题
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