How can you detect the cause of the degraded performance?

You notice that the performance of your production 24/7 Oracle database significantly
degraded. Sometimes you are not able to connect to the instance because it hangs. You do
not want to restart the database instance. How can you detect the cause of the degraded
performance?

A.
Enable Memory Access Mode, which reads performance data from SGA.

B.
Use emergency monitoring to fetch data directly from SGA analysis.

C.
Run Automatic Database Diagnostic Monitor (ADDM) to fetch information from the latest
Automatic Workload Repository (AWR) snapshots.

D.
Use Active Session History (ASH) data and hang analysis in regular performance
monitoring.

E.
Run ADDM in diagnostic mode.

Explanation: