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Oracle 1Z0-084 is a certification exam designed for professionals who wish to demonstrate their knowledge and skills in performance and tuning management of Oracle Database 19c. 1z1-084 exam is targeted towards database administrators, developers, and architects who are responsible for optimizing the performance of Oracle Database 19c in their organizations. Oracle Database 19c Performance and Tuning Management certification exam covers various topics such as tuning the database instance, SQL performance tuning, memory management, and more.

Oracle 1Z0-084 exam is a proctored exam that consists of 75 multiple-choice questions. 1z1-084 Exam Duration is 105 minutes, and candidates need to score a minimum of 63% to pass the exam. 1z1-084 exam content covers a wide range of topics, including database architecture, performance tuning methodologies, SQL tuning, memory management, and database monitoring.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q50-Q55):

NEW QUESTION # 50
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 Plan Baseline must be accepted in order to be used for the execution plan.
B. The execution plan is the one enforced by the SQL Plan Baseline.
C. The existence of two concurrent plan stability methods generates a child cursor for every execution.
D. The SQL Profiles as well as SQL Plan Baseline are implemented using hints, so they both generate the same plan.
E. The execution plan is the one enforced by the SQL Profile.
F. The conflict between the two plan stability methods results in an error.

Answer: A,E

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 # 51
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

A. The SGA size remains unaffected after disabling ASMM.
B. All auto-tuned SGA components are reset to their original user-defined values.
C. It requires a database instance restart to take effect.
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. All SGA components excluding fixed SGA and other internal allocations are readjusted immediately after disabling ASMM.

Answer: A,E

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 # 52
This error occurred more than four hours ago in the database:
ORA-04036 PGA memory used by the instance exceeds PGA_AGGREGATE_LIMIT
You want to know which process and query were at fault.
Which two views should you use for this purpose?

A. DBA_HIST_PROCESS_MEM_SUMMARY
B. DBA_HIST_SQLTEXT
C. DBA_HIST_ACTIVE_SESS_HISTORY
D. DBA_HIST_PGASTAT
E. DBA_HIST_SQLSTAT

Answer: A,C

Explanation:
To investigate the cause of the ORA-04036 error, which indicates that PGA memory usage exceeds the PGA_AGGREGATE_LIMIT, the appropriate views to consult are DBA_HIST_ACTIVE_SESS_HISTORY and DBA_HIST_PROCESS_MEM_SUMMARY.
* DBA_HIST_ACTIVE_SESS_HISTORY: This view provides historical information about active sessions in the database. It includes details about the SQL executed, the execution context, and the resources consumed by each session. By examining this view, you can identify the specific sessions and SQL queries that were active and potentially consuming excessive PGA memory around the time the ORA-04036 error occurred.
* DBA_HIST_PROCESS_MEM_SUMMARY: This view contains historical summaries of memory usage by processes. It can help in identifying the processes that were consuming a significant amount of PGA memory, leading to the ORA-04036 error. This view provides aggregated memory usage information over time, making it easier to pinpoint the processes responsible for high PGA memory consumption.
Together, these views offer a comprehensive overview of the memory usage patterns and specific queries or processes that might have contributed to exceeding the PGA_AGGREGATE_LIMIT, resulting in the ORA-
04036 error.
References:
* Oracle Database Reference: DBA_HIST_ACTIVE_SESS_HISTORY
* Oracle Database Reference: DBA_HIST_PROCESS_MEM_SUMMARY
* Oracle Database Performance Tuning Guide: Managing Memory

NEW QUESTION # 53
You need to collect and aggregate statistics for the ACCTG service and PAYROLL module, and execute:

Where do you find the output of this command?

A. By viewing V$SERVICE_STATS
B. By viewing V$SERV_MOD_ACT_STATS
C. In the current working directory
D. In $ORACLE_BASE/diag/rdbms/<db unique name>/<instance name>/trace

Answer: B

Explanation:
When you enable statistics gathering for a specific service and module using DBMS_MONITOR.
SERV_MOD_ACT_STAT_ENABLE, the output is aggregated and can be viewed using the V$SERV_MOD_ACT_STATS dynamic performance view. This view contains the cumulative statistics of database activity broken down by service and module, which is exactly what you collect when executing the provided command.
* B (Incorrect): While many types of trace files are located in the Diagnostic Destination directory (
$ORACLE_BASE/diag), the aggregated statistics for services and modules are not written to trace files but are instead viewable through dynamic performance views.
* C (Incorrect): The V$SERVICE_STATS view provides service-level statistics but does not provide the combined service/module-level breakdown.
* D (Incorrect): The output of the PL/SQL block is not written to a file in the current working directory; it is stored in the data dictionary and accessible via dynamic performance views.
References:
* Oracle Database PL/SQL Packages and Types Reference: DBMS_MONITOR
* Oracle Database Reference: V$SERV_MOD_ACT_STATS

NEW QUESTION # 54
A database instance is suffering poor I/O performance on two frequently accessed large tables.
No Big Table caching occurs in the database.
Examine these parameter settings:

Which are two actions either one of which will allow Big Table caching to occur?

A. Setting DB_KEEP_CACHE_SIZE to at least 50M
B. Increasing DB_CACHESIZE to 1 G
C. Increasing DB_BIG_TABLE_CACHE_PERCENT_TARGET to at least 50
D. Increasing DB_BIG_TABLE_CACHE_PERCENT_TARGET to at least 25
E. Setting PARALLEL_DEGREE_POLICYAUTO
F. Setting PARALLEL_DEGREE_POLICYADAPTIVE

Answer: B,D

Explanation:
Big Table caching is a feature that allows frequently accessed large tables to be cached in memory to improve I/O performance. From the parameter settings provided, Big Table caching is not occurring because DB_BIG_TABLE_CACHE_PERCENT_TARGET is set to 10, which is the minimum threshold for enabling the feature, but the size of the cache is too small for the big tables to be effectively cached.
To enable Big Table caching, one of the following actions could be taken:
* C (Correct): Increasing DB_BIG_TABLE_CACHE_PERCENT_TARGET to at least 25. This action would allocate a larger percentage of the buffer cache for storing big tables, which could allow for caching large tables and thus improve I/O performance.
* D (Correct): Increasing DB_CACHE_SIZE to 1G. Since the size of the buffer cache is a determining factor for how much data can be cached, increasing this parameter would provide more memory space for big tables to be cached.
Options A, B, E, and F will not enable Big Table caching because:
* A: Increasing DB_BIG_TABLE_CACHE_PERCENT_TARGET to 50 without adjusting the overall size of the cache might still not be sufficient if the DB_CACHE_SIZE is not large enough to hold the big tables.
* B: Setting DB_KEEP_CACHE_SIZE to at least 50M only specifies a separate buffer pool for objects with the KEEP cache attribute and does not affect Big Table caching.
* E: and F: Changing the PARALLEL_DEGREE_POLICY to ADAPTIVE or AUTO influences the behavior of parallel execution but does not directly enable or influence Big Table caching.
References:
* Oracle Database Performance Tuning Guide: Big Table Caching
* Oracle Database Reference: DB_BIG_TABLE_CACHE_PERCENT_TARGET
* Oracle Database Reference: DB_CACHE_SIZE

NEW QUESTION # 55
......

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1z1-084 Valid Exam Topics & New 1z1-084 Braindumps Free

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q50-Q55):

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