Oracle 1Z0-084 Exam - Topic 4 Question 28 Discussion

Actual exam question for Oracle's 1Z0-084 exam

Question #: 28
Topic #: 4

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

AStatspack 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.

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

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

DWhen WAIT TIME is high, instance tuning may improve performance.

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

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

Show Suggested Answer

Suggested Answer: A, E, F

Statspack is a performance diagnostic tool provided by Oracle prior to the introduction of the Automatic Workload Repository (AWR). At snap level 6, Statspack captures the following types of statistics:

A (Correct): Parent and child latches are captured. Latch statistics provide information about contention for latches, which are low-level serialization mechanisms used by Oracle.

E (Correct): Enqueue statistics, which provide information on the waits for locks that manage the concurrency between users.

F (Correct): Segment-level statistics, which provide detailed information on database segments such as tables, indexes, etc., to identify I/O and contention issues.

C (Incorrect): While optimizer execution plans are an essential aspect of performance tuning, detailed execution plan capture is not part of the Statspack report at level 6.

D (Incorrect): Plan usage data refers to how frequently a plan is being used, which is more associated with AWR and not typically captured in Statspack reports.

Oracle Database Performance Tuning Guide: Using Statspack

by Telma at Jan 23, 2025, 10:31 AM

Limited Time Offer

25%

Off

Get Premium 1Z0-084 Questions as Interactive Web-Based Practice Test or PDF

Contribute your Thoughts:

Submit Cancel

Eura

4 months ago

Wait, E says Parse Time only counts successful parses? That’s surprising!

upvoted 0 times

...

Casie

4 months ago

D is spot on, tuning can really help with high WAIT TIME!

upvoted 0 times

...

Angella

4 months ago

C seems off to me, not always true under heavy load.

upvoted 0 times

...

Cristy

5 months ago

I disagree with B, sometimes WAIT TIME can be more critical.

upvoted 0 times

...

Ressie

5 months ago

A is definitely true, SQL tuning can help when CPU time is high.

upvoted 0 times

...

Graciela

5 months ago

I vaguely remember that DB Time includes all user session time, but I'm not certain if it covers background processes too.

upvoted 0 times

...

Devon

5 months ago

I feel like WAIT TIME being high definitely suggests that instance tuning could help, but I’m not completely confident about that.

upvoted 0 times

...

Shelia

5 months ago

I think I practiced a question similar to this where we discussed the relationship between CPU time and WAIT TIME, but I can't recall the specifics.

upvoted 0 times

...

William

5 months ago

I remember something about how high CPU time can indicate a need for SQL tuning, but I'm not sure if that's always the case.

upvoted 0 times

...

Fernanda

5 months ago

Whew, this is a tough one. I'm going to need to really think through the relationships between the different time metrics and how they impact tuning strategies. Time to put on my problem-solving hat!

upvoted 0 times

...

Fatima

5 months ago

This is a great question to test our understanding of Oracle performance metrics. I'm feeling pretty confident I can identify the true statements, but I'll double-check my work to be sure.

upvoted 0 times

...

Winifred

5 months ago

Okay, I think I've got a handle on this. The key is understanding how CPU time, wait time, and DB time interact, and which tuning approaches are most effective in different scenarios. I'll methodically go through each option.

upvoted 0 times

...

Jean

5 months ago

Hmm, I'm a bit confused by the concepts in this question. I'll need to refresh my memory on the differences between CPU time, wait time, and how they relate to DB time and performance tuning.

upvoted 0 times

...

Mireya

6 months ago

This looks like a tricky question on Oracle performance tuning. I'll need to carefully review the details of v$sys_time_model and DB time to identify the true statements.

upvoted 0 times

...

Twana

11 months ago

Wait, so DB Time accounts for everything, even the time it takes for the coffee machine to brew a fresh cup? Gotta love those Oracle metrics!

upvoted 0 times

Edwin

9 months ago

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

upvoted 0 times

...

Shanice

10 months ago

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

upvoted 0 times

...

Richelle

10 months ago

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

upvoted 0 times

...

Alana

10 months ago

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

upvoted 0 times

...

Rory

10 months ago

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

upvoted 0 times

...

Queenie

10 months ago

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.

upvoted 0 times

...

Brigette

10 months ago

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.

upvoted 0 times

...

Elmira

11 months ago

Parse Time Elapsed only accounts for successful operations? That's good to know. I wonder if there's a way to track the unsuccessful ones too.

upvoted 0 times

...

Melissia

11 months ago

The proportion of WAIT TIME to CPU TIME increasing with load? That's interesting, but I'm not sure if it's always the case. Might depend on the specific workload.

upvoted 0 times

...

Alecia

11 months ago

Okay, so it's all about balancing CPU and WAIT time. I guess the key is to figure out which one is dominant and then focus on tuning that aspect.

upvoted 0 times

Dorothea

11 months ago

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

upvoted 0 times

...

Lavina

11 months ago

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.

upvoted 0 times

...

Eleonore

11 months ago

I believe statement F is true because DB Time includes time used by both background processes and user sessions.

upvoted 0 times

...

Paris

11 months ago

I agree with statement D, instance tuning can definitely help when WAIT TIME is high.

upvoted 0 times

...

Bambi

12 months ago

Hmm, I'm not sure about the Statspack part. Wouldn't it still be able to account for high CPU time even if it's a top event in DB time? Seems like a tricky one.

upvoted 0 times