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Oracle 1z0-084 Exam Sample Questions

Question # 1

Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

A. All auto-tuned SGA components are reset to their original user-defined values.

B. All SGA components excluding fixed SGA and other internal allocations are readjusted immediately after disabling ASMM.

C. Both SGA_TARGET and SGA_MAX_SIZE must be set to zero.

D. All SGA components retain their current sizes at the time of disabling.

E. The SGA size remains unaffected after disabling ASMM.

Answer

D. All SGA components retain their current sizes at the time of disabling.
E. The SGA size remains unaffected after disabling ASMM.

Explanation:

When ASMM is disabled, the sizes of the automatically managed SGA components remain at their current values. ASMM is controlled by theSGA_TARGETparameter. IfSGA_TARGETis set to a non-zero value, ASMM is enabled and Oracle will automatically manage the sizes of the various SGA components. When ASMM is disabled, by settingSGA_TARGETto zero, the SGA components that were automatically sized will retain their current sizes rather than being reset to their original user-defined values. The overall size of the SGA remains the same unless manually changed by modifying individual component sizes orSGA_MAX_SIZE.

References:

Oracle Database Administration Guide, 19c
Oracle Database Performance Tuning Guide, 19c

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Question # 2

Multiple sessions are inserting data concurrently into a table that has an LOB column. At some point in time, one of the sessions cannot find available space in the LOB segment and needs to allocate a new extent. Which wait event will be raised in the other sessions that need space in the LOB column?

A. enq: SQ - contention

B. enq: TM - contention

C. enq: HW - contention

D. enq: TX - allocate ITL entry

Answer

C. enq: HW - contention

Explanation:

When sessions concurrently insert data into a table with an LOB column and one session needs to allocate a new extent because it cannot find available space, the wait event associated with this contention is "enq: HW - contention". The HW stands for High Water Mark which is related to space allocation in the database segment. When asession needs to allocate a new extent, it may raise this wait event in other sessions that are also attempting to allocate space in the same LOB segment.

References

Oracle Database 19c Reference Guide - enq: HW - contention

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Question # 3

Which three types of statistics are captured by statspack with snap level 6?

A. Parent and child latches

B. Parent and child latches

C. Optimizer execution plans

D. Plan usage data

E. Enqueue statistics

Answer

A. Parent and child latches
E. Enqueue statistics

Explanation:

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.

References:

Oracle Database Performance Tuning Guide:Using Statspack

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Question # 4

Which two statements are true about cursor sharing?

A. Setting Cursor_sharing to FORCE can result in a plan that is suboptimal for the majority of values bound to a bind variable when executing a cursor with one or more bind variables.

B. Adaptive Cursor Sharing guarantees that a suboptimal plan will never be used on any execution of a SQL statement.

C. Setting optimizer_capture_sql_plan_baselines to TRUE loads all adaptive plans for the same statement into the cursor cache.

D. Setting cursor_sharing to EXACT prevents Adaptive Cursor Sharing from being used.

E. Adaptive Cursor Sharing requires histograms on filtered columns, used in equality predicates, to allow different execution plans to be generated for statements whose bound values would normally generate different plans at hard parse time.

Answer

A. Setting Cursor_sharing to FORCE can result in a plan that is suboptimal for the majority of values bound to a bind variable when executing a cursor with one or more bind variables.
D. Setting cursor_sharing to EXACT prevents Adaptive Cursor Sharing from being used.

Explanation:

A. WhenCursor_sharingis set toFORCE, Oracle tries to avoid hard parses by replacing literals in SQL statements with bind variables, even if the original statement didn't include bind variables. This can lead to the use of a single execution plan for multiple executions of a statement with different literal values, which might not be optimal for all executions.

D. Settingcursor_sharingtoEXACTensures that SQL statements must match exactly for them to share a cursor. This setting prevents the use of Adaptive Cursor Sharing (ACS) since ACS relies on the ability to share cursors among similar statements that differ only in their literal values. WithEXACT, there's no cursor sharing for statements with different literals, hence no opportunity for ACS to operate.

References:

Oracle Database SQL Tuning Guide, 19c

Oracle Database Reference, 19c

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Question # 5

You use SQL Tuning Advisor to tune a given SQL statement. The analysis eventually results in the implementation of a SQL Profile. You then generate the new SQL Profile plan and enforce it using a SQL PlanBaselinebut forget to disable the SQLProfile and a few days later you find out that the SQL Profile is generating a new execution plan. Which two statements are true?

A. The existence of two concurrent plan stability methods generates a child cursor for every execution.

B. The SQL Profiles as well as SQL Plan Baseline are implemented using hints, so they both generate the same plan.

C. The execution plan is the one enforced by the SQL Profile.

D. The execution plan is the one enforced by the SQL Plan Baseline.

E. The SQL Plan Baseline must be accepted in order to be used for the execution plan.

Answer

C. The execution plan is the one enforced by the SQL Profile.
E. The SQL Plan Baseline must be accepted in order to be used for the execution plan.

Explanation:

When both a SQL Profile and a SQL Plan Baseline are in place, the SQL Profile has a stronger preference and the optimizer is more likely to choose the execution plan from the SQL Profile.

C. A SQL Profile is generally more influential than a SQL Plan Baseline because it contains additional statistics and directives that help the optimizer to generate a more efficient execution plan. If both exist, the optimizer will use the profile's plan unless the baseline's plan is proven to be better through the SQL performance monitoring process.

E. SQL Plan Baselines must be accepted before they can be used by the optimizer. If a SQL Plan Baseline is not accepted, it will not be considered for generating the execution plan. Therefore, the presence of an unaccepted SQL Plan Baseline will not automatically force the optimizer to use its plan.

References:

Oracle Database SQL Tuning Guide, 19c

Oracle Database Administrator’s Guide, 19c

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