PASS GUARANTEED QUIZ 2025 ORACLE 1Z0-084: FIRST-GRADE ORACLE DATABASE 19C PERFORMANCE AND TUNING MANAGEMENT ACTUAL DUMPS

Pass Guaranteed Quiz 2025 Oracle 1Z0-084: First-grade Oracle Database 19c Performance and Tuning Management Actual Dumps

Pass Guaranteed Quiz 2025 Oracle 1Z0-084: First-grade Oracle Database 19c Performance and Tuning Management Actual Dumps

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Oracle 1Z0-084 Certification Exam is a challenging exam that requires a strong understanding of the Oracle Database 19c and its performance management features. 1Z0-084 exam consists of 80 multiple-choice questions that must be completed within a two-hour time frame. To pass the exam, candidates must score at least 63% on the exam. 1Z0-084 Exam can be taken at any authorized testing center or through an online proctoring service.

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The 1Z0-084 Exam is intended for experienced professionals who have already worked with Oracle Database 19c and have a solid understanding of the database architecture and administration. 1Z0-084 exam is designed to test the candidate's knowledge and skills in various areas related to performance and tuning management. 1Z0-084 exam consists of multiple-choice questions, scenario-based questions, and performance-based questions.

Oracle 1Z0-084 certification exam is a must for database administrators who want to demonstrate their expertise in Oracle Database 19c performance management. Oracle Database 19c Performance and Tuning Management certification provides a competitive edge in the industry and can lead to better job opportunities and career growth. Candidates should have a thorough understanding of performance tuning, monitoring, and troubleshooting techniques, as well as excellent knowledge of Oracle database architecture.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q35-Q40):

NEW QUESTION # 35
Examine this command:

What is the maximum number of baselines generated by this command that you can have at any given time?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: C

Explanation:
The DBMS_WORKLOAD_REPOSITORY.CREATE_BASELINE_TEMPLATE procedure is used to create a repeating baseline template in the Automatic Workload Repository (AWR). This template will generate baselines for a specified duration of time on a repeating schedule. The parameters of the CREATE_BASELINE_TEMPLATE procedure include the start and end times, as well as the day of the week and hour in the day when the baseline should be captured.
Given that the command specifies a repeating baseline every Monday at 5 PM with a duration of 3 hours and it expires after 30 days, the number of baselines generated by this command that you can have at any given time depends on how many Mondays fall within the most recent 30-day period.
Since the maximum number of Mondays that can occur within any 30-day period is 5 (four to five weeks), but considering the baseline has a duration of 3 hours and starts every Monday at 5 PM, only one baseline for each Monday can exist at a time. However, since baselines are preserved for 30 days, you could have multiple instances of Monday baselines preserved at a time.
* A (Incorrect): There can be more than one baseline at a time because the template will generate a baseline for every Monday during the 30-day expiration period.
* B (Incorrect): There will be more than three baselines because the template creates a baseline for every Monday within the 30-day expiration period.
* C (Correct): Over a 30-day period, considering the duration of the baselines and their frequency, you could have up to a maximum of 52 baselines if you consider the entire year.
* D (Incorrect): There is no option that restricts the number of baselines to 5 specifically, the answer relies on the calculation of how many baselines can exist over a period of time considering their expiration.
References:
* Oracle Database PL/SQL Packages and Types Reference: DBMS_WORKLOAD_REPOSITORY


NEW QUESTION # 36
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 conflict between the two plan stability methods results in an error.
  • B. The SQL Plan Baseline must be accepted in order to be used for the execution plan.
  • C. The SQL Profiles as well as SQL Plan Baseline are implemented using hints, so they both generate the same plan.
  • D. The execution plan is the one enforced by the SQL Profile.
  • E. The execution plan is the one enforced by the SQL Plan Baseline.
  • F. The existence of two concurrent plan stability methods generates a child cursor for every execution.

Answer: B,D

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 # 37
Which two options are part of a Soft Parse operation?

  • A. Shared Pool Memory Allocation
  • B. Syntax Check
  • C. SQL Optimization
  • D. SQL Row Source Generation
  • E. Semantic Check

Answer: E

Explanation:
During a soft parse, Oracle checks the shared SQL area to see if an incoming SQL statement matches one already in the shared pool. This operation includes syntax and semantic checks. The syntax check ensures the statement is properly formed, and the semantic check confirms that all the objects referenced in the SQL statement exist and that the user has the necessary privileges to access them.References:
* Oracle Database Concepts, 19c
* Oracle Database SQL Tuning Guide, 19c


NEW QUESTION # 38
You want to reduce the amount of db file scattered read that is generated in the database. You execute the SQL Tuning Advisor against the relevant workload. Which two can be part of the expected result?

  • A. recommendations regarding rewriting the SQL statements
  • B. recommendations regarding the creation of materialized views
  • C. recommendations regarding the creation of additional indexes
  • D. recommendations regarding partitioning the tables
  • E. recommendations regarding the creation of SQL Patches

Answer: A,C

Explanation:
https://docs.oracle.com/en/database/oracle/oracle-database/21/tgsql/sql-tuning-advisor.html#GUID-
8E1A39CB-A491-4254-8B31-9B1DF7B52AA1
The goal is to reduce the db file scattered read waits, which are associated with full table scans. These are I
/O operations where Oracle retrieves data blocks scattered across the disk, typically when large amounts of data are read inefficiently. Running the SQL Tuning Advisor analyzes the workload and provides tuning recommendations. Let's evaluate the options.
Why A. Recommendations regarding the creation of additional indexes is correct:
* Full table scans (which cause db file scattered read) often occur because suitable indexes are missing.
* The SQL Tuning Advisor can identify queries that would benefit from indexes and recommend creating them. Indexes allow the database to access data more efficiently using row lookups, reducing the need for full table scans.
Why B. Recommendations regarding rewriting the SQL statements is correct:
* Sometimes, poorly written SQL statements cause inefficient execution plans that lead to db file scattered read.
* SQL Tuning Advisor can recommend SQL rewrites to make better use of indexes, avoid full table scans, or optimize joins. For example:
* Rewriting predicates to use indexed columns.
* Using hints to guide the optimizer.
Why Other Options Are Incorrect:
* C. Recommendations regarding the creation of materialized views:
* Materialized views are typically recommended to optimize complex queries involving aggregations or joins, not to address db file scattered read directly. They are less relevant for solving I/O issues caused by full table scans in this context.
* D. Recommendations regarding the creation of SQL Patches:
* SQL Patches are used to influence the execution plan for specific SQL statements. While SQL Patches can potentially fix performance issues, the SQL Tuning Advisor focuses on improving SQL and database design rather than patching queries.
* E. Recommendations regarding partitioning the tables:
* Partitioning tables can improve query performance, especially for very large datasets. However, this is a database design-level recommendation and is not typically provided by SQL Tuning Advisor. Partitioning would not directly target db file scattered read.
How SQL Tuning Advisor Helps:
The SQL Tuning Advisor provides actionable recommendations, such as:
* Creating indexes to reduce full table scans.
* Rewriting SQL to optimize the execution plan.
* Improving statistics to help the optimizer make better decisions.
References to Oracle Documentation:
* Oracle Database 19c Performance Tuning Guide:
* Section: Using SQL Tuning Advisor to Optimize Workloads.
* Explains recommendations for indexes and SQL rewrites to reduce I/O.
* Understanding Wait Events:
* Details about db file scattered read and how to address it.


NEW QUESTION # 39
Accessing the SALES tables causes excessive db file sequential read wait events.
Examine this AWR except:

Now, examine these attributes displayed by querying dba_tables:

Finally, examine these parameter settings:

Which two must both be used to reduce these excessive waits?

  • A. Partition the SALES table.
  • B. Re-create the SALES table.
  • C. Coalesce all sales table indexes.
  • D. Compress the SALES table.
  • E. Increase PCTFREE for the SALES table.

Answer: A,D

Explanation:
The AWR excerpt points to excessive physical reads on the SALES table and index, suggesting the need for optimizing table storage and access.
Partitioning the SALES table (A) can reduce 'db file sequential read' waits by breaking down the large SALES table into smaller, more manageable pieces. This can localize the data and reduce the I/O necessary for query operations.
Compressing the SALES table (D) can also help reduce I/O by minimizing the amount of data that needs to be read from disk. This can also improve cache utilization and reduce the 'db file sequential read' waits.
References:
* Oracle Database VLDB and Partitioning Guide, 19c
* Oracle Database Administrator's Guide, 19c
These changes are recommended based on Oracle's best practices for managing large tables and reducing I/O waits, ensuring better performance and efficiency.


NEW QUESTION # 40
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