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Oracle 1Z0-084 certification exam is designed to test an individual's knowledge and skills in managing the performance and tuning of Oracle Database 19c. Oracle Database 19c Performance and Tuning Management certification is intended for database administrators who want to become proficient in managing the performance of Oracle databases and tuning them to meet the demands of their organization. 1Z0-084 exam covers a wide range of topics, including performance analysis and tuning, memory management, SQL tuning, and performance monitoring.

To prepare for the Oracle 1Z0-084 exam, candidates should have a solid understanding of the Oracle Database architecture and its components. They should also be familiar with the SQL language and have experience in using performance tuning tools such as SQL Tuning Advisor, Automatic Workload Repository (AWR), and Automatic Database Diagnostic Monitor (ADDM). Additionally, candidates should have practical experience in diagnosing and resolving common performance issues.

To pass the Oracle 1Z0-084 Exam, candidates must have a deep understanding of Oracle Database 19c architecture and its associated components. They should be able to identify and resolve performance issues using tools such as SQL Tuning Advisor, Automatic Workload Repository, and Oracle Enterprise Manager. Candidates should also be proficient in monitoring database performance and tuning system parameters to optimize database performance. Successful completion of the Oracle 1Z0-084 exam demonstrates a candidate's ability to manage and tune Oracle Database 19c systems effectively, making them a valuable asset to any organization that relies on Oracle Database technology.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q42-Q47):

NEW QUESTION # 42
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

A. The SGA size remains unaffected after disabling ASMM.
B. All SGA components retain their current sizes at the time of disabling.
C. Both SGA_TARGET and SGA_MAX_SIZE must be set to zero.
D. All SGA components excluding fixed SGA and other internal allocations are readjusted immediately after disabling ASMM.
E. It requires a database instance restart to take effect.
F. All auto-tuned SGA components are reset to their original user-defined values.

Answer: A,B

Explanation:
When ASMM is disabled, the sizes of the automatically managed SGA components remain at their current values. ASMM is controlled by the SGA_TARGET parameter. If SGA_TARGET is 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 setting SGA_TARGET to 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 or SGA_MAX_SIZE.
References:
* Oracle Database Administration Guide, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 43
Which two options are part of a Soft Parse operation?

A. Shared Pool Memory Allocation
B. SQL Row Source Generation
C. Syntax Check
D. Semantic Check
E. SQL Optimization

Answer: D

NEW QUESTION # 44
Which two actions can cause invalidation or loss of one or more results in the SQL Query Result Cache?

A. A request was made by the RCBG background of a non-RAC database.
B. A request was made by the RCBG background process in a physical standby database that is opened read only and whose primary has a result cache.
C. result_cache_max_size is set dynamically to 0.
D. Decreasing the value set for RESULT_CACHE_REMOTE_EXPIRATION.
E. One or more results were aged out of the result cache.

Answer: C,E

Explanation:
The SQL Query Result Cache stores the results of queries and PL/SQL function calls for reuse. However, entries in the result cache can be invalidated or lost under certain conditions:
A: Results can be aged out of the cache when the cache becomes full and new results need to be stored. This process ensures that the cache does not exceed its allocated memory and that it contains the most recently used entries.
B: Setting theRESULT_CACHE_MAX_SIZEparameter to 0 will effectively disable the result cache and all cached results will be lost, as Oracle will no longer allocate any memory to the result cache.
References:
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 45
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 SQL Profiles as well as SQL Plan Baseline are implemented using hints, so they both generate the same plan.
B. The execution plan is the one enforced by the SQL Profile.
C. The conflict between the two plan stability methods results in an error.
D. The SQL Plan Baseline must be accepted in order to be used for the execution plan.
E. The existence of two concurrent plan stability methods generates a child cursor for every execution.
F. The execution plan is the one enforced by the SQL Plan Baseline.

Answer: B,D

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

NEW QUESTION # 46
Which three types of statistics are captured by statspack with snap level 6?

A. Enqueue statistics
B. Segment-level statistics
C. Parent and child latches
D. Plan usage data
E. Optimizer execution plans
F. Parent and child latches

Answer: A,B,F

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

NEW QUESTION # 47
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