Oracle Exam 1Z0-084 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

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Twana

9 days 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!

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Elmira

11 days 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.

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Melissia

15 days 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.

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26 days 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.

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Jeffrey

10 days 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.

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Lura

1 months ago

I think statement A is true because SQL tuning can indeed improve performance when CPU time is high.

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