1Z0-083 Exam Dumps | Which three are true about monitoring waits for sessions and services? (Choose three.)

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Question 47/139

Which three are true about monitoring waits for sessions and services? (Choose three.)

A. V$SESSION_EVENT displays all waits for all past and existing sessions if the wait has occurred at least once for a session.

B. V$SERVICE_EVENT displays all waits for all services if the wait has occurred at least once for a service.

C. V$SESSION_WAIT_CLASS displays waits broken down by wait class only for waiting sessions.

D. V$SESSION_WAIT and V$SESSION both contain details of the event on which a non-waiting session last waited.

E. V$SESSION_EVENT displays all waits for all past sessions if the wait has occurred at least once for a session.

F. V$SESSION_WAIT and V$SESSION both contain details of the event on which a session is currently waiting.

Correct Answer: B,D,F

A, E - False : V$SESSION_EVENT displays information on waits for an event by a session.
V$SESSION_WAIT_HISTORY displays the last 10 wait events for each active session.
B - V$SERVICE_EVENT displays aggregated wait counts and wait times for each wait statistic.
C - False : V$SESSION_WAIT_CLASS displays the time spent in various wait event operations on a per-session basis.
D, F - True : V$SESSION_WAIT displays the current or last wait for each session.
V$SESSION.EVENT If the session is currently waiting, then the resource or event for which the session is waiting. If the session is not in a wait, then the resource or event for which the session most recently waited.
Resource :
https://docs.oracle.com/en/database/oracle/oracle-database/19/refrn/V-
SESSION_EVENT.html#GUID-5723D404-83F7-4C8D-8BF2-031B3FFEAAA8

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