ORACLE 1Z1-084 VALID STUDY NOTES - 1Z1-084 TEST DURATION

Oracle 1z1-084 Valid Study Notes - 1z1-084 Test Duration

Oracle 1z1-084 Valid Study Notes - 1z1-084 Test Duration

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Because industry of information technology is fast-moving. To excel in this advanced industry, pass the 1z1-084 exam of the Oracle 1z1-084 certification. Hundreds of applicants have faced issues in updated dumps material to crack the Oracle 1z1-084 examination in one go.

Oracle 1Z0-084 (Oracle Database 19c Performance and Tuning Management) Certification Exam is a professional certification exam offered by Oracle to validate the skills and knowledge of individuals in performance and tuning management of Oracle Database 19c. 1z1-084 exam is designed for professionals who work with Oracle Database administrators, database developers, and other IT professionals who are responsible for the overall performance of an Oracle Database 19c environment. 1z1-084 exam tests the candidate's knowledge on various topics like database architecture, SQL tuning, performance analysis, and performance tuning best practices.

Oracle Database 19c Performance and Tuning Management certification exam consists of 80 multiple-choice questions that need to be completed within 120 minutes. 1z1-084 Exam covers various topics such as database performance analysis, SQL tuning, memory management, and resource management. The candidates need to demonstrate their proficiency in these areas to pass the exam.

>> Oracle 1z1-084 Valid Study Notes <<

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Earning the Oracle 1Z0-084 certification demonstrates a high level of expertise in Oracle Database 19c Performance and Tuning Management. Oracle Database 19c Performance and Tuning Management certification can help individuals advance their careers in database administration and development. It also provides organizations with a way to identify individuals who have the necessary skills and knowledge to manage and tune Oracle Database 19c for optimal performance.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q52-Q57):

NEW QUESTION # 52
Examine this statement and its corresponding execution plan:

Which phase introduces the CONCATENATION step?

  • A. SQL Adaptive Execution
  • B. SQL Transformation
  • C. SQL Execution
  • D. SQL Semantic Check
  • E. SQL Row Source Generation

Answer: B

Explanation:
The CONCATENATION step in an execution plan is introduced during the SQL Transformation phase. This phase is part of the optimizer's query transformations which can include various techniques to rewrite the query for more efficient execution. The CONCATENATION operation is used to combine the results of two separate SQL operations, typically when there is an OR condition in the WHERE clause, as seen in the provided query.
References:
* Oracle Database SQL Tuning Guide, 19c
* Oracle Database Concepts, 19c


NEW QUESTION # 53
Which two types of performance problems are reported by ADDM for PDBS?

  • A. User I/O waits
  • B. SGA sizing issues
  • C. Top SQL statements
  • D. I/O capacity limits
  • E. Excessive checkpoint writes

Answer: A,D

Explanation:
The Automatic Database Diagnostic Monitor (ADDM) analyzes and reports on various types of performance problems. For Pluggable Databases (PDBs), it can identify issues such as I/O capacity limits which may hinder the overall performance by causing bottlenecks. Additionally, ADDM can report on user I/O waits, which can indicate performance issues related to the time it takes for user queries to read data from the disk.
References:
* Oracle Multitenant Administrator's Guide, 19c
* Oracle Database Performance Tuning Guide, 19c


NEW QUESTION # 54
Which three statements are true about server-generated alerts?

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

Answer: A,D,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 # 55
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 # 56
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_dynamic_sampling=11
  • C. optimizer_adaptive_statistics = TRUE
  • D. optimizer_features_enable=12.2.0.1
  • E. optimizer_adaptive_plans=TRUE

Answer: C

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 # 57
......

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