1Z1-084 VALID EXAM BLUEPRINT | PASS4SURE 1Z1-084 PASS GUIDE

1z1-084 Valid Exam Blueprint | Pass4sure 1z1-084 Pass Guide

1z1-084 Valid Exam Blueprint | Pass4sure 1z1-084 Pass Guide

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Oracle 1Z0-084 or Oracle Database 19c Performance and Tuning Management Exam is one of the most sought-after certification exams for database professionals. 1z1-084 exam is designed to test the candidate's knowledge and skills in performance tuning and management of the Oracle Database 19c. Oracle Database 19c Performance and Tuning Management certification exam is specially designed for professionals who are working on Oracle Database ecosystems and need to optimize the database's performance and manage the resources efficiently.

Oracle 1Z0-084 certification exam consists of 75 multiple-choice questions that must be answered in 120 minutes. 1z1-084 Exam is computer-based and can be taken at authorized testing centers worldwide. Candidates must score at least 63% to pass the exam and earn the certification. 1z1-084 exam fee is $245 USD, and candidates can register for the exam on the Oracle website.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q51-Q56):

NEW QUESTION # 51
Examine this statement and output:

Which three statements are true?

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

Answer: B,C,E

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 # 52
A Standard Edition production database has performance problems for two hours on the same day each week.
Which tool must you use to diagnose the problem?

  • A. SQL Performance Analyzer
  • B. Statspack report
  • C. Database Replay
  • D. AWR Compare Periods report

Answer: B

Explanation:
For a Standard Edition production database, the Statspack tool is available to diagnose performance problems.
The Automatic Workload Repository (AWR) and its related tools like AWR Compare Periods report and SQL Performance Analyzer are features of the Oracle Database Enterprise Edition and are not available in Standard Edition. Database Replay is also a feature of the Enterprise Edition. Statspack is a performance diagnostic tool provided for earlier versions and Standard Editions of the Oracle Database to collect, store, and analyze performance data.
References
* Oracle Database 19c Administrator's Guide - Using Statspack to Diagnose Database Performance Issues


NEW QUESTION # 53
You execute the following:
EXECUTE DBMS_AuTO_TASK_ADMIN.DISABLE;
Which advisor remains enabled?

  • A. Automatic SQL Tuning
  • B. SQL Plan Management Evolve Advisor
  • C. Automatic Segment Advisor
  • D. Optimizer Statistics Advisor
  • E. Automatic Optimizer Statistics Collection

Answer: E

Explanation:
When you executeDBMS_AUTO_TASK_ADMIN.DISABLE, it disables all automated maintenance tasks related to the Auto Task framework. This includes tasks such as the Automatic SQL Tuning Advisor, Automatic Segment Advisor, and others. However, the Automatic Optimizer Statistics Collection (D) remains enabled as it is not part of the Auto Task framework. The gathering of optimizer statistics is controlled separately and is a critical part of the database's self-tuning mechanism to ensure the optimizer has up-to-date information about the data distribution within tables and indexes.
References
* Oracle Database 19c PL/SQL Packages and Types Reference - DBMS_AUTO_TASK_ADMIN
* Oracle Database 19c Database Administrator's Guide - Managing Optimizer Statistics


NEW QUESTION # 54
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. PGAA_AGGREGATE should be set to at least 800 MB.
  • C. With a target of 700 MB or more, all multipass executions work areas would be eliminated.
  • D. GGREGATE_TARGET should be set to at least 700 MB.

Answer: A

Explanation:
The query output from V$PGA_TARGET_ADVICE provides tuning information for the PGA (Program Global Area). Let's break it down step by step:
Key Columns in the Output:
* TARGET_MB:
* Represents the hypothetical PGA_AGGREGATE_TARGET values (in megabytes) evaluated by Oracle.
* CACHE_HIT_PERC:
* The percentage of work areas that could execute in-memory (optimal execution) without requiring temporary disk writes.
* Higher percentages indicate fewer work areas requiring disk I/O.
* ESTD_OVERALLOC_COUNT:
* The estimated number of work areas that need to go to disk (multipass operations or overallocations).
Observations from the Data:
* At TARGET_MB = 700 MB:
* The CACHE_HIT_PERC is 68%.
* The ESTD_OVERALLOC_COUNT is 30. This indicates that some multipass work areas still exist.
* At TARGET_MB = 800 MB:
* The CACHE_HIT_PERC rises to 74%.
* The ESTD_OVERALLOC_COUNT drops to 0. This indicates that no work areas require multipass execution.
* At TARGET_MB = 900 MB and above:
* The CACHE_HIT_PERC increases slightly to 82%-84%.
* The ESTD_OVERALLOC_COUNT remains 0, meaning that all work areas are now either optimal or one-pass.
Why D is Correct:
* At 800 MB or more, the ESTD_OVERALLOC_COUNT is 0, indicating that all one-pass execution work areas are eliminated.
* A one-pass execution requires temporary disk I/O for intermediate results, but with sufficient PGA, these are no longer necessary.
Why Other Options Are Incorrect:
* Option A:
* It mentions all multipass executions work areas would be eliminated at 700 MB. This is incorrect because, at 700 MB, the ESTD_OVERALLOC_COUNT is still 30, indicating some multipass work areas still exist.
* Option B:
* Suggests setting the PGA_AGGREGATE_TARGET to at least 800 MB, which is partially correct but does not address the elimination of one-pass execution.
* Option C:
* Suggests setting the PGA_AGGREGATE_TARGET to at least 700 MB, which is not sufficient to eliminate all one-pass executions, as shown by the ESTD_OVERALLOC_COUNT of 30.


NEW QUESTION # 55
Which statement is true about DB time in V$$YS_TIME_MODEL?

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

Answer: D

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 # 56
......

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