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Oracle 1Z0-084 exam covers a wide range of topics related to performance tuning and management of Oracle Database 19c. 1Z0-084 exam tests the candidate's ability to identify and troubleshoot performance issues, optimize database performance, and implement performance-related features and functionalities. 1Z0-084 exam also covers topics such as database monitoring, capacity planning, and performance tuning methodologies.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q39-Q44):

NEW QUESTION # 39
The CURS0R_SHARING and OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES parameters are set to default. The top five wait events in an awr report are due to a large number of hard parses because of several almost identical SQL statements.
Which two actions could reduce the number of hard parses?

* A. Increase the size of the library cache.
* B. Create the KEEP cache and cache tables accessed by the SQL statements.
* C. Create the RECYCLE cache and cache tables accessed by the SQL statements.
* D. Set OPTIMIZER_CAPTURE_SQL_PLAN_BASELINESto TRUE.
* E. Set the CURSOR_SHARING parameter to FORCE.
Answer: A,E

Explanation:
To reduce the number of hard parses due to several almost identical SQL statements, you can take the following actions:
* C (Correct):Increasing the size of the library cache can help reduce hard parses by providing more
* memory to store more execution plans. This allows SQL statements to be shared more effectively.
* E (Correct):Setting theCURSOR_SHARINGparameter toFORCEwill cause Oracle to replace literals in SQL statements with bind variables, which can significantly reduce the number of hard parses by making it more likely that similar SQL statements will share the same execution plan.
The other options do not directly impact the number of hard parses:
* A (Incorrect):Creating the KEEP cache and caching tables accessed by the SQL statements can improve performance for those tables, but it does not directly reduce the number of hard parses.
* B (Incorrect):Creating the RECYCLE cache and caching tables accessed by the SQL statements can make it more likely that objects will be removed from the cache quickly, which does not help with hard parse issues.
* D (Incorrect):SettingOPTIMIZER_CAPTURE_SQL_PLAN_BASELINEStoTRUEcan help stabilize SQL execution plans but will not reduce the number of hard parses. This parameter is used to automatically capture SQL plan baselines for repeatable SQL statements, which can prevent performance regressions due to plan changes.
References:
* Oracle Database Performance Tuning Guide:Minimizing Hard Parses
* Oracle Database SQL Tuning Guide:CURSOR_SHARING

NEW QUESTION # 40
Which statement is true about DB time in V$$YS_TIME_MODEL?

* A. DB time can be many times greater than the elapsed time since the database instance started.
* B. DB tine excludes the time spent waiting for a CPU in the operating system run queue.
* C. DB time includes the time spent executing the RMAN backup and restore command.
* D. DB time is organized as a simple list of statistics and any time period is attributable to only one statistic.
Answer: A

Explanation:
DB time includes the time spent on user and background processes. It can be greater than the elapsed time because it accumulates the active time of all the processes. For example, if two sessions are each active for 2 seconds at the same time, DB time would accumulate 4 seconds, while the elapsed time would be only 2 seconds.References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Reference, 19c

NEW QUESTION # 41
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. Lack of temporary tablespace space for sort operations can be prevented by using temporary tablespace groups.
* 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. When a session consumes all temporary tablespace storage, then the session would hang until the temporary space used by that session is cleared.
* E. When a global temporary table instantiation is too large to fit in memory, space is allocated in a temporary tablespace.
Answer: B,E

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)racle 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 # 42
Examine this output of a query of VSPGA_TAPGET_ADVICE:

Which statements is true'

* A. With a target of 800 MB or more, all one-pass execution work areas would be eliminated.
* B. With a target of 700 MB or more, all multipass executions work areas would be eliminated.
* C. PGAA_AGGREGATE should be set to at least 800 MB.
* D. GGREGATE_TARGET should be set to at least 700 MB.
Answer: B

Explanation:
The V$PGA_TARGET_ADVICE view provides advice on potential performance improvements by adjusting the PGA_AGGREGATE_TARGET parameter. The column ESTD_OVERALLOC_COUNT indicates the estimated number of work areas that would perform multiple passes if the PGA_AGGREGATE_TARGET were set to the size in the TARGET_MB column.
A: According to the output, at the target of 700 MB, the ESTD_OVERALLOC_COUNT is 30. This suggests that if PGA_AGGREGATE_TARGET is set to 700 MB, 30 multipass execution work areas would be required. If we look further down, at the target of 800 MB, the ESTD_OVERALLOC_COUNT is 0, indicating that increasing PGA_AGGREGATE_TARGET to 800 MB or more would eliminate the need for multipass executions, not at 700 MB as initially suggested by the option. Hence, the verified answer derived from the data is slightly nuanced; it should be 800 MB to eliminate all multipass executions.
References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Reference, 19c

NEW QUESTION # 43
Examine this statement and its corresponding execution plan:

Which phase introduces the CONCATENATION step?

* A. SQL Execution
* B. SQL Adaptive Execution
* C. SQL Transformation
* D. SQL Row Source Generation
* E. SQL Semantic Check
Answer: C

Explanation:
The CONCATENATION step in an execution plan is introduced during the SQL Transformation phase. This phase is part of the optimizer's query transformations which can include various techniques to rewrite the query for more efficient execution. The CONCATENATION operation is used to combine the results of two separate SQL operations, typically when there is an OR condition in the WHERE clause, as seen in the provided query.
References:
* Oracle Database SQL Tuning Guide, 19c
* Oracle Database Concepts, 19c

NEW QUESTION # 44
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