1Z0-084 BRAIN EXAM | 1Z0-084 VALID TEST QUESTIONS

1Z0-084 Brain Exam | 1Z0-084 Valid Test Questions

1Z0-084 Brain Exam | 1Z0-084 Valid Test Questions

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Tags: 1Z0-084 Brain Exam, 1Z0-084 Valid Test Questions, Exam 1Z0-084 Topic, 1Z0-084 Exam Dumps, Downloadable 1Z0-084 PDF

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Oracle 1Z0-084 exam is an essential certification for IT professionals who specialize in database performance and tuning management. Oracle Database 19c Performance and Tuning Management certification validates the candidates' expertise in designing, implementing, and managing Oracle Database 19c performance and tuning solutions. 1Z0-084 exam covers a wide range of topics related to performance tuning, including database architecture, memory management, SQL tuning, database monitoring, and optimization techniques.

Oracle 1Z0-084 Exam is an essential certification for professionals who want to enhance their career prospects in the field of database administration and performance tuning. Oracle Database 19c Performance and Tuning Management certification is recognized globally and is highly valued by employers. Oracle Database 19c Performance and Tuning Management certification demonstrates the candidate's expertise in database performance and tuning management and their ability to optimize database performance.

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Oracle 1Z0-084 Certification Exam covers a wide range of topics related to performance and tuning management, including database monitoring, performance analysis, performance tuning, and troubleshooting. 1Z0-084 exam also covers advanced topics such as resource management, database consolidation, and high availability. To pass the exam, candidates must have a deep understanding of all these topics and must be able to apply their knowledge in real-world scenarios.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q31-Q36):

NEW QUESTION # 31
A database supporting a mixed workload is hosted on a server with 64 CPUs.
A large number of free buffer waits and buffer busy waits occur affecting performance.
The buffer cache size was then increased but after a few hours, the same wait events occur more often than before the change.
Examine these parameter settings:

Which two actions can help reduce the number of these waits7

  • A. setting dbwr_io_slaves to 64
  • B. increasing the value of DBWRITERPROCESSES to 64,
  • C. increasing the value of DB_FILE_MULTIBLOCK_READ_COUNT to 128
  • D. reducing the values of DB_FILE_MULTILOCK_READ_COUNT to 64
  • E. Increasing the size of MEMORYTARGET

Answer: A,B

Explanation:
Given a server with 64 CPUs, if the buffer cache size increase did not alleviate free buffer waits and buffer busy waits, one can look into optimizing I/O and the efficiency of the DB writer processes.
C: Setting the DBWR_IO_SLAVES parameter to a non-zero value, such as the number of CPUs, would initiate I/O slave processes to assist the DB writer process. This can help reduce I/O contention when writing from the buffer cache to disk, particularly for systems without asynchronous I/O capabilities.
D: Increasing the value of DBWRITERPROCESSES enables multiple DB writer processes to be active simultaneously. In a system with many CPUs, such as 64, increasing this value can improve the write throughput to disk and potentially reduce buffer busy waits.
References:
* Oracle Database Reference, 19c
* Oracle Database Performance Tuning Guide, 19c


NEW QUESTION # 32
Which three statements are true about server-generated alerts?

  • A. They can be viewed only from the Cloud Control Database home page.
  • B. They are logged in the alert log.
  • C. They provide notifications but never any suggestions for correcting the identified problems.
  • D. Their threshold settings can be modified by using DBMS_SERVER_ALERT.
  • E. They are notifications from the Oracle Database Server of an existing or impending problem.
  • F. They may contain suggestions for correcting the identified problems.

Answer: B,E,F

Explanation:
Server-generated alerts in Oracle Database are designed to notify DBAs and other administrators about issues within the database environment. These alerts can be triggered by a variety of conditions, including threshold-based metrics and specific events such as ORA- error messages. Here's how these options align with the statements provided:
* A (True):Server-generated alerts are indeed notifications from the Oracle Database Server that highlight existing or impending issues. These alerts are part of Oracle's proactive management capabilities, designed to inform administrators about potential problems before they escalate.
* C (True):These alerts are logged in the alert log of the Oracle Database. The alert log is a crucial diagnostic tool that records major events and changes in the database, including server-generated alerts.
This log is often the first place DBAs look when troubleshooting database issues.
* F (True):Server-generated alerts may include suggestions for correcting identified problems. Oracle Database often provides actionable advice within these alerts to assist in resolving issues more efficiently. These suggestions can range from adjusting configuration parameters to performing specific maintenance tasks.
Options B, D, and E do not accurately describe server-generated alerts:
* B (False):While the statement might have been true in some contexts, Oracle's server-generated alerts often include corrective suggestions, making this statement incorrect.
* D (False):Server-generated alerts can be viewed from various interfaces, not just the Cloud Control Database home page. They are accessible through Enterprise Manager, SQL Developer, and directly within the database alert log, among other tools.
* E (False):While it's true that threshold settings for some alerts can be modified, the method specified, usingDBMS_SERVER_ALERT, is not correct. Threshold settings are typically adjusted through Enterprise Manager or by modifying specific initialization parameters directly.
References:
* Oracle Database Documentation:Oracle Database 19c: Performance Management and Tuning
* Oracle Base: Alert Log and Trace Files
* Oracle Support:Understanding and Managing Server-Generated Alerts


NEW QUESTION # 33
Users complain about slowness and session interruptions. Additional checks reveal the following error in the application log:

Which file has additional information about this error?

  • A. Session trace file SQL trace file automatically generated by the error
  • B. SQL trace file automatically generated by the error
  • C. ASH report
  • D. Alert log

Answer: D

Explanation:
When an ORA-00060 deadlock error occurs, detailed information about the error and the deadlock graph are dumped into the alert log. This log contains a trace file name that you can use to find additional detailed information about the sessions involved in the deadlock and the SQL statements they were executing.
References:
* Oracle Database Administrator's Guide, 19c
* Oracle Database Error Messages, 19c


NEW QUESTION # 34
Which three statements are true about tuning dimensions and details of v$sys_time_model and DB time?

  • A. When WAIT TIME is high, instance tuning may improve performance.
  • B. 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.
  • C. Systems in which CPU time is dominant need more tuning that those in which WAIT TIME is dominant.
  • D. DB Time accounts for all time used by background processes and user sessions.
  • E. The proportion of WAIT TIME to CPU TIME always increases with increased system load.
  • F. Parse Time Elapsed accounts for successful soft and hard parse operations only.

Answer: A,B,D

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 # 35
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 SQL Profiles as well as SQL Plan Baseline are implemented using hints, so they both generate the same plan.
  • B. The conflict between the two plan stability methods results in an error.
  • C. The execution plan is the one enforced by the SQL Plan Baseline.
  • D. The execution plan is the one enforced by the SQL Profile.
  • E. The existence of two concurrent plan stability methods generates a child cursor for every execution.
  • F. The SQL Plan Baseline must be accepted in order to be used for the execution plan.

Answer: D,F

Explanation:
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


NEW QUESTION # 36
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