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

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出自：Oracle认证

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