AUTHENTIC ORACLE 1Z0-084 EXAM QUESTIONS BY EXPERTS

Authentic Oracle 1Z0-084 Exam Questions by Experts

Authentic Oracle 1Z0-084 Exam Questions by Experts

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Oracle 1Z0-084 (Oracle Database 19c Performance and Tuning Management) certification exam is designed to test the candidate's knowledge and skills in database performance and tuning management. Oracle Database 19c Performance and Tuning Management certification is intended for professionals who work with Oracle databases and want to gain expertise in optimizing database performance for better efficiency and productivity.

The Oracle 1Z0-084 exam measures the candidate's understanding of various topics such as database architecture, memory management, SQL tuning, database performance analysis, and more. It is aimed at professionals who are responsible for managing and maintaining databases, ensuring their optimal performance, and troubleshooting issues that may arise.

Oracle 1Z0-084 is an exam that tests the knowledge and skills of individuals in the area of Oracle Database 19c Performance and Tuning Management. 1Z0-084 exam is designed for individuals who are responsible for managing and tuning the performance of Oracle Database 19c. It is an important certification for database administrators and developers who want to demonstrate their expertise in performance tuning.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q27-Q32):

NEW QUESTION # 27
You manage a 19c database with default optimizer settings.
This statement is used extensively as subquery in the application queries:
SELECT city_id FROM sh2.sales WHERE city_id=:Bl
You notice the performance of these queries is often poor and, therefore, execute:
SELECT city_id,COUNT(*) FROM sh2.sales GROUP BY city_id;
Examine the results:

There is no index on the CITY_ID column.
Which two options improve the performance?

  • A. Activate the adaptive plans.
  • B. Use a SQL Profile to enforce the appropriate plan.
  • C. Generate frequency histograms on the CITY__ID column.
  • D. Force the subquery to use dynamic sampling.
  • E. Create an index on the CITY IP column.

Answer: C,E

Explanation:
In this scenario, creating an index and generating frequency histograms are two methods that can potentially improve performance:
* A (Correct):Generating frequency histograms on theCITY_IDcolumn can help the optimizer make better decisions regarding the execution plan, especially if the data distribution is skewed. Histograms provide the optimizer with more detailed information about the data distribution in a column, which is particularly useful for columns with non-uniform distributions.
* B (Correct):Creating an index on theCITY_IDcolumn would speed up queries that filter on this column, especially if it's used frequently in the WHERE clause as a filter. An index would allow for an index range scan instead of a full table scan, reducing the I/O and time needed to execute such queries.
* C (Incorrect):While SQL profiles can be used to improve the performance of specific SQL statements, they are usually not the first choice for such a problem, and creating a profile does not replace the need for proper indexing or statistics.
* D (Incorrect):Forcing the subquery to use dynamic sampling might not provide a consistent performance benefit, especially if the table statistics are not representative or are outdated. However, dynamic sampling is not as effective as having accurate statistics and a well-chosen index.
* E (Incorrect):Adaptive plans can adjust the execution strategy based on the conditions at runtime.
While they can be useful in certain scenarios, in this case, creating an index and ensuring accurate statistics would likely provide a more significant performance improvement.
References:
* Oracle Database SQL Tuning Guide:Managing Optimizer Statistics
* Oracle Database SQL Tuning Guide:Using Indexes and Clusters


NEW QUESTION # 28
Examine these statements and output:

What parameter change activates the generation and use of SQL Plan Directives7

  • A. optimizer_adaptive_plans=TRUE
  • B. optimizer_features_enable=12.2.0.1
  • C. optimizer_dynamic_sampling=11
  • D. optimizer_adaptive_statistics = TRUE
  • E. optimizer_capture_sql_plan_baselines_TRUE

Answer: D

Explanation:
The optimizer_adaptive_statistics parameter, when set to TRUE, enables the optimizer to use adaptive statistics, such as SQL Plan Directives, to help improve plans by automatically adjusting them based on the actual execution statistics.
References:
* Oracle Database SQL Tuning Guide, 19c


NEW QUESTION # 29
You must produce a consolidated formatted trace file by combining all trace files generated by all clients for a single service.
Which combination of utilities does this?

  • A. TKPROF and Trace Analyzer
  • B. Trace Analyzer and Tracsess
  • C. Autotrace and TKPROF
  • D. Trcsess and TKPROF

Answer: D

Explanation:
To produce a consolidated formatted trace file from multiple trace files generated by all clients for a single service, the combination oftrcsessandTKPROFutilities is used. Thetrcsessutility consolidates trace files based on specified criteria such as session, client identifier, or service name. This results in a single trace file that combines the desired tracing information. Next,TKPROFis used to format the output of the trace file generated bytrcsess, providing a readable summary of the trace, including execution counts, execution times, and SQL statement text along with execution plans.
Steps:
* Usetrcsessto combine trace files:
* Command:trcsess output=consolidated.trc service=your_service_name *.trc
* UseTKPROFto format the consolidated trace file:
* Command:tkprof consolidated.trc output.txt explain=user/password sys=no sort=prsela,fchela References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Utilities, 19c


NEW QUESTION # 30
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 process in a physical standby database that is opened read only and whose primary has a result cache.
  • B. result_cache_max_size is set dynamically to 0.
  • C. A request was made by the RCBG background of a non-RAC database.
  • D. Decreasing the value set for RESULT_CACHE_REMOTE_EXPIRATION.
  • E. One or more results were aged out of the result cache.

Answer: B,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 # 31
Which two statements are true about space usage in temporary tablespaces?

  • A. Temporary tablespaces setting Includes quotas to limit temporary space used by a session for that Temporary tablespace.
  • B. When a global temporary table instantiation is too large to fit in memory, space is allocated in a temporary tablespace.
  • C. A sort will fail if a sort to disk requires more disk space and no additional extent can be found/allocated in/for the sort segment.
  • D. Lack of temporary tablespace space for sort operations can be prevented by using temporary tablespace groups.
  • E. When a session consumes all temporary tablespace storage, then the session would hang until the temporary space used by that session is cleared.

Answer: B,D

Explanation:
Regarding space usage in temporary tablespaces, the following statements are true:
* A (Correct):When a global temporary table or a sort operation exceeds the available memory, Oracle Database allocates space in a temporary tablespace to store the temporary data or intermediate results.
* E (Correct):Using temporary tablespace groups can prevent insufficient temporary tablespace for sort operations by providing a collective pool of space from multiple temporary tablespaces, which can be used for user sorting operations.
The other options provided have inaccuracies:
* B (Incorrect):Oracle does not provide a mechanism for setting quotas on temporary tablespaces. Quotas can be set for permanent tablespaces but not for temporary ones.
* C (Incorrect):A sort operation may fail due to insufficient space, but Oracle will attempt to allocate space in the temporary tablespace dynamically. If no space can be allocated, an error is returned rather than a sort failure.
* D (Incorrect):If a session consumes all available temporary tablespace storage, Oracle will not hang the session; it will return an error to the session indicating that it has run out of temporary space.
References:
* Oracle Database Administrator's Guide:Managing Space for Schema Objects
* Oracle Database Concepts:Temporary Tablespaces


NEW QUESTION # 32
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