(Choose all that apply.)

Identify situations in which collecting statistics at the service level helps diagnosing performance
problems. (Choose all that apply.)

A.
in a database where you want to monitor and diagnose individual sessions

B.
in a database where you want to statistically measure the workload of jobs

C.
in a database that supports an application where the client directly creates a session

D.
in multitier environments where a request from an end client is routed to different database
sessions