Which two are true about Oracle database wait events that are described in V$EVENT_NAME? (Choose two.)

Question

Options

• AThey reveal the cause of performance problems.
• BThey are grouped into classes.
• CThey are maintained at the session and system level.
• DThey display how often a database instance performs particular operations.
• EAll events might be used by an instance regardless of parameter settings.

• A
  79% (19)
• B
  4% (1)
• C
  4% (1)
• E
  13% (3)

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