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1Z0-084 PDF Download, Interactive 1Z0-084 Questions

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The Oracle 1Z0-084 exam is designed to test individuals on their proficiency in performance tuning and management, including monitoring, measurement, analysis, and tuning of Oracle Database 19c. 1Z0-084 exam also assesses the candidate’s ability to work with Automatic Workload Repository (AWR), Automatic Database Diagnostic Monitor (ADDM), Automatic SQL Tuning (AST), and many other tools and techniques that are needed to optimize database performance.

Oracle 1Z0-084 Exam is designed to test a candidate's knowledge and skills in managing and tuning the performance of an Oracle Database 19c system. 1Z0-084 exam is intended for database administrators, performance analysts, and technical consultants who are responsible for ensuring the optimal performance of Oracle Database systems. 1Z0-084 exam covers a range of topics, including database architecture, memory management, SQL tuning, and system troubleshooting.

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Oracle 1Z0-084 Certification Exam is designed for individuals who want to demonstrate their expertise in managing the performance and tuning of Oracle Database 19c. 1Z0-084 exam is aimed at database administrators, performance analysts, and developers who want to prove their skills in managing and tuning Oracle Database 19c to ensure optimal performance.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q13-Q18):

NEW QUESTION # 13
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.

Answer: A,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 # 14
During which application lifecycle phase do you take baselines?

A. Testing
B. Deployment
C. Production
D. Migration or upgrade
E. Design and development

Answer: C

Explanation:
Baselines are typically taken during the production phase of the application lifecycle. They provide a snapshot of performance metrics under normal operating conditions which can be used for comparison against future performance. Baselines are essential for understanding how the system performs under its typical workload and for detecting deviations from this expected performance over time, especially after changes like migrations, upgrades, or significant changes in user activity.
References
* Oracle Database 19c Performance Tuning Guide - Managing Performance Through Baselines

NEW QUESTION # 15
This error occurred more than four hours ago in the database:
ORA-04036 PGA memory used by theinstance exceedsPGA_AGGREGATE_LIMIT
You want to know which process and query were at fault.
Which two views should you use for this purpose?

A. DBA_HIST_ACTIVE_SESS_HISTORY
B. DBA_HIST_SQLTEXT
C. DBA_HIST_PROCESS_MEM_SUMMARY
D. DBA_HIST_PGASTAT
E. DBA_HIST_SQLSTAT

Answer: A,C

Explanation:
To investigate the cause of the ORA-04036 error, which indicates that PGA memory usage exceeds the PGA_AGGREGATE_LIMIT, the appropriate views to consult are DBA_HIST_ACTIVE_SESS_HISTORYandDBA_HIST_PROCESS_MEM_SUMMARY.
* DBA_HIST_ACTIVE_SESS_HISTORY:This view provides historical information about active sessions in the database. It includes details about the SQL executed, the execution context, and the resources consumed by each session. By examining this view, you can identify the specific sessions and SQL queries that were active and potentially consuming excessive PGA memory around the time the ORA-04036 error occurred.
* DBA_HIST_PROCESS_MEM_SUMMARY:This view contains historical summaries of memory usage by processes. It can help in identifying the processes that were consuming a significant amount of PGA memory, leading to the ORA-04036 error. This view provides aggregated memory usage information over time,making it easier to pinpoint the processes responsible for high PGA memory consumption.
Together, these views offer a comprehensive overview of the memory usage patterns and specific queries or processes that might have contributed to exceeding thePGA_AGGREGATE_LIMIT, resulting in the ORA-04036 error.
References:
* Oracle Database Reference:DBA_HIST_ACTIVE_SESS_HISTORY
* Oracle Database Reference:DBA_HIST_PROCESS_MEM_SUMMARY
* Oracle Database Performance Tuning Guide:Managing Memory

NEW QUESTION # 16
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

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

Answer: E,F

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 # 17
Examine this statement and output:

Which three statements are true?

A. Both 9822 and 8779 sessions are waiting for operating system resources.
B. Session 9857 is not waiting.
C. 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.
D. Session 9857 waited 1354 seconds for another process, which was also waiting for a transaction to end.
E. Session 8779 may be waiting for a user or application response.
F. Session 8779 may be waiting due to a network problem.

Answer: C,E,F

Explanation:
For this SQL statement and output, we can analyze the EVENT column 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 # 18
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