单选题
发布日期:2020-04-10
The optimizer statistics are collected automatically.
Only the timed operating system (OS) statistics and plan execution statistics are collected.
The Oracle server dynamically generates the necessary statistics on tables as part of query optimization.
The snapshots for the Automatic Workload Repository (AWR) are not generated automatically.
Snapshots cannot be collected manually by using DBMS_WORKLOAD_REPOSITORY PACKAGE.
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