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To pass the Oracle 1Z0-084 exam, candidates must have a deep understanding of Oracle Database 19c architecture and its associated components. They should be able to identify and resolve performance issues using tools such as SQL Tuning Advisor, Automatic Workload Repository, and Oracle Enterprise Manager. Candidates should also be proficient in monitoring database performance and tuning system parameters to optimize database performance. Successful completion of the Oracle 1Z0-084 exam demonstrates a candidate's ability to manage and tune Oracle Database 19c systems effectively, making them a valuable asset to any organization that relies on Oracle Database technology.

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The Oracle 1z1-084 Exam covers a wide range of topics, including performance tuning concepts, SQL tuning, database resource management, performance monitoring and troubleshooting, and database performance optimization. Candidates must have a solid understanding of these topics to pass the exam. Additionally, candidates must be familiar with various tools and techniques used in performance and tuning management, such as Oracle Enterprise Manager, Oracle Cloud Control, and Oracle SQL Developer.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q18-Q23):

NEW QUESTION # 18
During which application lifecycle phase do you take baselines?

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

Answer: D

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 # 19
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: A

Explanation:
TheDBMS_WORKLOAD_REPOSITORY.CREATE_BASELINE_TEMPLATEprocedure 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. Theparameters of the CREATE_BASELINE_TEMPLATEprocedure 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 # 20
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

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

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 # 21
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

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

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 theSGA_TARGETparameter. IfSGA_TARGETis 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 settingSGA_TARGETto 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 # 22
What are the least elevated values of statistics_level and C0NTR0LJ4ANAGEMENT_PACK_ACCESS that allow the usage of Monitoring of Database Operations?

A. STATISTICS_LEVEL=TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS-
DIAGOSTIC*TUNING
B. STATISTICS_LEVEL=ALL and
CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC+TUNING
C. STATISTICS_LEVEL=TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC
D. STATISTICS_LEVEL=BASIC and CONTROL_MANAGEMENT_PACK ACCESS=DIAGOSTIC

Answer: B

Explanation:
Monitoring of Database Operations requires that the STATISTICS_LEVEL parameter be set to ALL and CONTROL_MANAGEMENT_PACK_ACCESS be set to DIAGNOSTIC+TUNING. These settings enable all the advisory features and automatic tuning features within the Oracle Database, including the Automatic Workload Repository (AWR), Automatic Database Diagnostic Monitor (ADDM), and the full functionality of the SQL Tuning Advisor and SQL Access Advisor, which are components of the Diagnostic and Tuning packs.
* STATISTICS_LEVEL=ALL: This setting enables the collection of all system statistics for problem detection and self-tuning purposes.
* CONTROL_MANAGEMENT_PACK_ACCESS=DIAGNOSTIC+TUNING: This grants access to both the Diagnostic Pack and the Tuning Pack, which are essential for detailed performance monitoring and tuning capabilities.
References:
* Oracle Database Reference: STATISTICS_LEVEL
* Oracle Database Licensing Information User Manual: Oracle Database Management Packs

NEW QUESTION # 23
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