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Die Oracle 1Z0-084 Zertifizierungsprüfung ist ein computerbasierter Test, der aus 70 Multiple-Choice-Fragen besteht. Der Kandidat hat eine Zeitbegrenzung von 105 Minuten, um die Prüfung abzuschließen. Die Prüfungsfragen sind darauf ausgelegt, das Wissen des Kandidaten im Bereich Performance- und Tuning-Management von Oracle Database 19c zu testen. Die Prüfung umfasst Themen wie Datenbankarchitektur, SQL-Tuning, Performance-Analyse und Best Practices für Performance-Tuning.

Oracle Database 19c Performance and Tuning Management 1Z0-084 Prüfungsfragen mit Lösungen (Q19-Q24):

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

Antwort: C,D

Begründung:
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

20. Frage
Which statement is true about DB time in V$$YS_TIME_MODEL?

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

Antwort: C

Begründung:
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

21. Frage
Which two actions can cause invalidation or loss of one or more results in the SQL Query Result Cache?

A. One or more results were aged out of the result cache.
B. Decreasing the value set for RESULT_CACHE_REMOTE_EXPIRATION.
C. 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.
D. A request was made by the RCBG background of a non-RAC database.
E. result_cache_max_size is set dynamically to 0.

Antwort: A,E

Begründung:
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

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

A. All SGA components retain their current sizes at the time of disabling.
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 auto-tuned SGA components are reset to their original user-defined values.
E. The SGA size remains unaffected after disabling ASMM.
F. It requires a database instance restart to take effect.

Antwort: A,E

Begründung:
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 or SGA_MAX_SIZE.
References:
* Oracle Database Administration Guide, 19c
* Oracle Database Performance Tuning Guide, 19c

23. Frage
You must write a statement that returns the ten most recent sales. Examine this statement:

Users complain that the query executes too slowly. Examine the statement's current execution plan:

What must you do to reduce the execution time and why?

A. Collect a new set of statistics on PRODUCT, CUSTOMERS, and SALES because the current stats are inaccurate.
B. Enable Adaptive Plans so that Oracle can change the Join method as well as the Join order for this query.
C. Create an index on SALES.TIME_ID to force the return of rows in the order specified by the ORDER BY clause.
D. Replace the FETCH FIRST clause with ROWNUM to enable the use of an index on SALES.
E. Create an index on SALES.CUST_ID to force an INDEX RANGE SCAN on this index followed by a NESTED LOOP join between CUSTOMERS and SALES.

Antwort: C

Begründung:
The execution plan shows a full table access for theSALEStable. To reduce the execution time, creating an index onSALES.TIME_IDwould be beneficial as it would allow the database to quickly sort and retrieve the most recent sales without the need to perform a full table scan, which is I/O intensive and slower. By indexing TIME_ID, which is used in theORDER BYclause, the optimizer can take advantage of the index to efficiently sort and limit the result set to the ten most recent sales.
* B (Incorrect):ReplacingFETCH FIRSTwithROWNUMwould not necessarily improve the performance unless there is an appropriate index that the optimizer can use to avoid sorting the entire result set.
* C (Incorrect):There is no indication that the current statistics are inaccurate; hence, collecting new statistics may not lead to performance improvement.
* D (Incorrect):While adaptive plans can provide performance benefits by allowing the optimizer to adapt the execution strategy, the main issue here is the lack of an index on theORDER BYcolumn.
* E (Incorrect):Creating an index onSALES.CUST_IDcould improve join performance but would not address the performance issue caused by the lack of an index on theORDER BYcolumn.
References:
* Oracle Database SQL Tuning Guide:Managing Indexes
* Oracle Database SQL Tuning Guide:Using Indexes and Clusters

24. Frage
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