Which of the following checks are useful for database performance monitoring? There are 3 correct answers to this question.

Which of the following checks are useful for database performance monitoring? There are 3 correct answers to this question.
A . Check the data buffer quality.
B . Check the shared cursor cache for expensive SQL statements.
C . Check the filling degree of tablespaces.
D . Check for tables with more than 100 extents.
E . Check if the Optimizer statistics are refreshed regularly.

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Answer: A,B,E