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Your database instance is started using an SPFILE. You are connected to cdb$root, as a DBA. You issue: SQL> ALTER SYSTEM SET STATISTICS_LEVEL=ALL SCOPE=BOTH; Which two statements are true about the statistics level parameter?
Correct Answer: A,D
Explanation/Reference: Explanation: When the STATISTICS_LEVEL parameter is modified by ALTER SYSTEM, all advisories or statistics are dynamically turned on or off, depending on the new value of STATISTICS_LEVEL. When modified by ALTER SESSION, the following advisories or statistics are turned on or off in the local session only. Their system-wide state is not changed.