多选题Examine the parameters for your database instance: Which three statements are true about the process of automatic optimization by using cardinality feedback?（）AThe optimizer automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics.BThe optimizer can re optimize a query only once using cardinality feedback.CThe optimizer enables monitoring for cardinality feedback after the first execution of a query.DThe optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.EAfter the optimizer identifies a query as a re-optimization candidate, statistics collected by thecollectors are submitted to the optimizer.
多选题
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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