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In your database，the STATISTICS_LEVEL initialization parameter is set to BASIC. What is the impact of this setting？（）
A:The optimizer statistics are collected automatically.
B:Only the timed operating system （OS） statistics and plan execution statistics are collected.
C:The Oracle server dynamically generates the necessary statistics on tables as part of query optimization.
D:The snapshots for the Automatic Workload Repository （AWR） are not generated automatically. 
E:Snapshots cannot be collected manually by using DBMS_WORKLOAD_REPOSITORY PACKAGE.

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出自：Oracle认证

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