1Z0-084 Exam Dumps | Which three statements are true about tuning dimensions and details of v$sys_time

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Oracle Database 19c Performance and Tuning Management
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Question 19/24

Which three statements are true about tuning dimensions and details of v$sys_time_model and DB time?

A. Statspack cannot account for high CPU time when CPU TIME is a Top 10 event in DB time. When CPU time is high, SQL tuning may improve performance.

B. Systems in which CPU time is dominant need more tuning that those in which WAIT TIME is dominant.

C. The proportion of WAIT TIME to CPU TIME always increases with increased system load.

D. When WAIT TIME is high, instance tuning may improve performance.

E. Parse Time Elapsed accounts for successful soft and hard parse operations only.

F. DB Time accounts for all time used by background processes and user sessions.

Correct Answer: A,D,F

A: Statspack is a performance diagnostic tool that can help identify high CPU usage issues. High CPU time may indicate that SQL statements need to be tuned for better performance.
D: High wait times can often be reduced by instance tuning, such as adjusting database parameters or improving I/O performance.
F: DB Time is a cumulative time metric that includes the time spent by both user sessions and background processes executing database calls.References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Concepts, 19c

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