100% PASS 2025 RELIABLE ORACLE 1Z1-084 RELIABLE EXAM VCE

100% Pass 2025 Reliable Oracle 1z1-084 Reliable Exam Vce

100% Pass 2025 Reliable Oracle 1z1-084 Reliable Exam Vce

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Oracle 1Z0-084 certification exam focuses on performance and tuning management for Oracle Database 19c. 1z1-084 Exam is designed for professionals who want to enhance their skills in improving database performance and reducing system downtime. The 1Z0-084 exam is intended for database administrators, system engineers, and technical consultants who have a good understanding of Oracle Database 19c concepts and technologies.

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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 Database 19c Performance and Tuning Management exam aims to assess the candidates' knowledge of this important area of expertise. In particular, the exam focuses on the design and implementation of system infrastructure, the management of database performance and its optimization, the identification and resolution of performance issues in the database, and knowledge of performance monitoring and data management.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q36-Q41):

NEW QUESTION # 36
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

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

Answer: B,D

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 # 37
Which two statements are true about session wait information contained in v$session or v$session_wait?

  • A. Rows for sessions that are not waiting might contain the actual wait time for the last event for which they waited.
  • B. Rows for sessions displaying WAITED UNKNOWN TIME in the STATE column indicate that the session is still waiting.
  • C. Rows for sessions that are not waiting always contain the total wait time since the session started.
  • D. Rows for sessions that are currently waiting have a wait time of 0.
  • E. Rows for sessions that are currently waiting have their wait time incremented every microsecond.

Answer: A,D

Explanation:
In theV$SESSIONview, Oracle provides information about the session waits:
B: When theWAIT_TIMEcolumn has a value of 0, it signifies that the session is currently waiting for a resource. This column represents the duration of the current or last wait.
C: If the session is not actively waiting, theWAIT_TIMEcolumn shows the time the session spent waiting for the last wait event. If theSTATEcolumn is showing "WAITED KNOWN TIME", it means the session is not currently waiting, but it indicates the time for which it had waited.
References:
* Oracle Database Reference, 19c
* Oracle Database Performance Tuning Guide, 19c


NEW QUESTION # 38
Database performance has degraded recently.
index range scan operations on index ix_sales_time_id are slower due to an increase in buffer gets on sales table blocks.
Examine these attributes displayed by querying DBA_TABLES:

Now, examine these attributes displayed by querying DBA_INDEXES:

Which action will reduce the excessive buffer gets?

  • A. Re-create the SALES table using the columns in IX_SALES_TIME_ID as the hash partitioning key.
  • B. Partition index IX_SALES_TIME_ID using hash partitioning.
  • C. Re-create index IX_SALES_TIME_ID using ADVANCED COMPRESSION.
  • D. Re-create the SALES table sorted in order of index IX_SALES_TIME_ID.

Answer: C

Explanation:
Given that index range scan operations onIX_SALES_TIME_IDare slower due to an increase in buffer gets, the aim is to improve the efficiency of the index access. In this scenario:
* B (Correct):Re-creating the index usingADVANCED COMPRESSIONcan reduce the size of the index, which can lead to fewer physical reads (reduced I/O) and buffer gets when the index is accessed, as more of the index can fit into memory.
The other options would not be appropriate because:
* A (Incorrect):Re-creating theSALEStable sorted in order of the index might not address the issue of excessive buffer gets. Sorting the table would not improve the efficiency of the index itself.
* C (Incorrect):Using the columns inIX_SALES_TIME_IDas a hash partitioning key for theSALES table is more relevant to data distribution and does not necessarily improve index scan performance.
* D (Incorrect):Hash partitioning the index is generally used to improve the scan performance in a parallel query environment, but it may not reduce the number of buffer gets in a single-threaded query environment.
References:
* Oracle Database SQL Tuning Guide:Managing Indexes
* Oracle Database SQL Tuning Guide:Index Compression


NEW QUESTION # 39
Examine this output of a query of VSPGA_TAPGET_ADVICE:

Which statements is true'

  • A. With a target of 700 MB or more, all multipass executions work areas would be eliminated.
  • B. With a target of 800 MB or more, all one-pass execution work areas would be eliminated.
  • C. GGREGATE_TARGET should be set to at least 700 MB.
  • D. PGAA_AGGREGATE should be set to at least 800 MB.

Answer: B

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 # 40
You execute the following:
EXECUTE DBMS_AuTO_TASK_ADMIN.DISABLE;
Which advisor remains enabled?

  • A. Optimizer Statistics Advisor
  • B. Automatic SQL Tuning
  • C. Automatic Segment Advisor
  • D. SQL Plan Management Evolve 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 # 41
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