1Z0-060 Web TestEngine demo

Examine the parameters for your database instance:

Which three statements are true about the process of automatic optimization by using cardinality feedback?

Select all that apply.

• 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.