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Oracle 1Z0-084 certification exam is an excellent opportunity for professionals to enhance their skills and knowledge in performance tuning and management of Oracle Database 19c. It is a valuable certification that can help them to advance their career in database administration. 1z1-084 exam covers various topics that are essential for professionals working in this field, and passing it can increase their credibility and marketability.
Oracle 1Z0-084 certification exam is a comprehensive test that covers a wide range of topics related to Oracle Database 19c performance and tuning. 1z1-084 Exam consists of 75 multiple-choice questions that must be completed within 120 minutes. 1z1-084 exam is computer-based and can be taken at authorized testing centers worldwide.
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Oracle Database 19c Performance and Tuning Management Sample Questions (Q54-Q59):
NEW QUESTION # 54
Examine these statements and output:
What parameter change activates the generation and use of SQL Plan Directives7
- A. optimizer_capture_sql_plan_baselines_TRUE
- B. optimizer_adaptive_statistics = TRUE
- C. optimizer_adaptive_plans=TRUE
- D. optimizer_features_enable=12.2.0.1
- E. optimizer_dynamic_sampling=11
Answer: B
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 # 55
SGA_TARGET and PGA_AGGREGATE_TARGET are configured to nonzero values.
MEMORY_target is then set to a nonzero value but memory_MAX_TARGET is not set.
Which two statements are true?
Answer: B,E
Explanation:
When MEMORY_TARGET is set to a nonzero value, Oracle automatically manages the memory allocation between the System Global Area (SGA) and the Program Global Area (PGA). If MEMORY_MAX_TARGET is not explicitly set, Oracle will behave in the following manner:
* MEMORY_MAX_TARGET will default to the value of MEMORY_TARGET, assuming the platform allows for the value of MEMORY_TARGET to be increased dynamically. This means that MEMORY_TARGET represents both the initial allocation and the maximum limit for the dynamically managed memory unless MEMORY_MAX_TARGET is specified differently.
* If MEMORY_TARGET is set to a value that is less than the sum of the current values of SGA_TARGET and PGA_AGGREGATE_TARGET, Oracle will use the higher sum as the default value for MEMORY_MAX_TARGET to ensure that there is adequate memory for both areas. The database instance will not start if MEMORY_TARGET is not sufficient to accommodate the combined SGA and PGA requirements.
References
* Oracle Database Administrator's Guide 19c: Automatic Memory Management
* Oracle Database Performance Tuning Guide 19c: Using Automatic Memory Management
NEW QUESTION # 56
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. Generate frequency histograms on the CITY__ID column.
- B. Create an index on the CITY IP column.
- C. Activate the adaptive plans.
- D. Force the subquery to use dynamic sampling.
- E. Use a SQL Profile to enforce the appropriate plan.
Answer: A,B
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 the CITY_ID column 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 the CITY_ID column 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 # 57
Examine this statement and output:
Which three statements are true?
- A. Session 9822 will always stop waiting if the session that owns the TX enqueue issues a COMMIT statement as session 9822 is the first session in the transaction queue.
- B. Session 9857 waited 1354 seconds for another process, which was also waiting for a transaction to end.
- C. Session 8779 may be waiting due to a network problem.
- D. Session 8779 may be waiting for a user or application response.
- E. Both 9822 and 8779 sessions are waiting for operating system resources.
- F. Session 9857 is not waiting.
Answer: A,C,D
Explanation:
For this SQL statement and output, we can analyze theEVENTcolumn to understand the type of wait:
B: The event "SQL*Net message from client" typically indicates that the session is waiting for a response from the client. This can be due to a network issue, user response, or an application processing delay.
E: The event "SQL*Net message from client" also implies that the session is idle waiting for the client (a user or an application) to send a request to the server. This event usually indicates that the session is not actively working but is instead waiting for the next command.
F: The wait event "enq: TX - row lock contention" suggests that session 9822 is waiting for a row-level lock held by another session. If the holding session issues a COMMIT or ROLLBACK, the lock will be released, and session 9822 will stop waiting. Since this session is experiencing row lock contention, it implies it's waiting for a specific transaction to complete.
References:
* Oracle Database Reference, 19c
* Oracle Wait Events Documentation
NEW QUESTION # 58
Which three statements are true about tuning dimensions and details of v$sys_time_model and DB time?
- A. Statspack cannot account for high CPU time when CPU TIME is a Top 10 event in DB time. When CPU time is high, SQL tuning may improve performance.
- B. The proportion of WAIT TIME to CPU TIME always increases with increased system load.
- C. Parse Time Elapsed accounts for successful soft and hard parse operations only.
- D. Systems in which CPU time is dominant need more tuning that those in which WAIT TIME is dominant.
- E. DB Time accounts for all time used by background processes and user sessions.
- F. When WAIT TIME is high, instance tuning may improve performance.
Answer: A,E,F
Explanation:
A: Statspack is a performance diagnostic tool that can help identify high CPU usage issues. High CPU time may indicate that SQL statements need to be tuned for better performance.
D: High wait times can often be reduced by instance tuning, such as adjusting database parameters or improving I/O performance.
F: DB Time is a cumulative time metric that includes the time spent by both user sessions and background processes executing database calls.References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Concepts, 19c
NEW QUESTION # 59
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