<{p}>64、Which three are true about the Oracle Optimizer?<{/p}>

发布于 2021-04-23 21:05:35
【多选题】
A It can re-optimize execution plans after previous executions detect suboptimal plans
B It considers the filters in WHERE clauses when generating execution plans for SQL statements
C It can only use SQL Plan Directives tied to the SQL statement for which a plan is being generated
D It considers object statistics when generating execution plans for SQL statements
E It updates stale object statistics in the Data Dictionary
F It obeys all hints.

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