Oracle 1z1-084 Latest Real Exam - Reliable 1z1-084 Study Plan
BTW, DOWNLOAD part of ActualTestsQuiz 1z1-084 dumps from Cloud Storage: https://drive.google.com/open?id=1Imwhg_MLVdz56RgKeyL_9uJirm6PrDx0
The desktop Oracle Database 19c Performance and Tuning Management (1z1-084) practice exam software helps its valued customer to be well aware of the pattern of the real 1z1-084 exam. You can try a free Oracle Database 19c Performance and Tuning Management (1z1-084) demo too. This Oracle Database 19c Performance and Tuning Management (1z1-084) practice test is customizable and you can adjust its time and Oracle Database 19c Performance and Tuning Management (1z1-084) exam 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 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 Latest Real Exam <<
Reliable Oracle 1z1-084 Study Plan | Exam 1z1-084 Online
The Oracle Database 19c Performance and Tuning Management 1z1-084 certification offers a great opportunity for beginners and professionals to demonstrate their skills and abilities to perform a certain task. For the complete, comprehensive, for Oracle Database 19c Performance and Tuning Management 1z1-084 Exam Preparation you can get assistance from Oracle Database 19c Performance and Tuning Management Exam Questions.
Oracle Database 19c Performance and Tuning Management Sample Questions (Q15-Q20):
NEW QUESTION # 15
A database supporting a mixed workload is hosted on a server with 64 CPUs.
A large number of free buffer waits and buffer busy waits occur affecting performance.
The buffer cache size was then increased but after a few hours, the same wait events occur more often than before the change.
Examine these parameter settings:
Which two actions can help reduce the number of these waits7
Answer: B,E
Explanation:
Given a server with 64 CPUs, if the buffer cache size increase did not alleviate free buffer waits and buffer busy waits, one can look into optimizing I/O and the efficiency of the DB writer processes.
C: Setting theDBWR_IO_SLAVESparameter to a non-zero value, such as the number of CPUs, would initiate I/O slave processes to assist the DB writer process. This can help reduce I/O contention when writing from the buffer cache to disk, particularly for systems without asynchronous I/O capabilities.
D: Increasing the value ofDBWRITERPROCESSESenables multiple DB writer processes to be active simultaneously. In a system with many CPUs, such as 64, increasing this value can improve the write throughput to disk and potentially reduce buffer busy waits.
References:
* Oracle Database Reference, 19c
* Oracle Database Performance Tuning Guide, 19c
NEW QUESTION # 16
You must write a statement that returns the ten most recent sales. Examine this statement:
Users complain that the query executes too slowly. Examine the statement's current execution plan:
What must you do to reduce the execution time and why?
Answer: E
Explanation:
The execution plan shows a full table access for theSALEStable. To reduce the execution time, creating an index onSALES.TIME_IDwould be beneficial as it would allow the database to quickly sort and retrieve the most recent sales without the need to perform a full table scan, which is I/O intensive and slower. By indexing TIME_ID, which is used in theORDER BYclause, the optimizer can take advantage of the index to efficiently sort and limit the result set to the ten most recent sales.
* B (Incorrect):ReplacingFETCH FIRSTwithROWNUMwould not necessarily improve the performance unless there is an appropriate index that the optimizer can use to avoid sorting the entire result set.
* C (Incorrect):There is no indication that the current statistics are inaccurate; hence, collecting new statistics may not lead to performance improvement.
* D (Incorrect):While adaptive plans can provide performance benefits by allowing the optimizer to adapt the execution strategy, the main issue here is the lack of an index on theORDER BYcolumn.
* E (Incorrect):Creating an index onSALES.CUST_IDcould improve join performance but would not address the performance issue caused by the lack of an index on theORDER BYcolumn.
References:
* Oracle Database SQL Tuning Guide:Managing Indexes
* Oracle Database SQL Tuning Guide:Using Indexes and Clusters
NEW QUESTION # 17
What are the least elevated values of statistics_level and C0NTR0LJ4ANAGEMENT_PACK_ACCESS that allow the usage of Monitoring of Database Operations?
Answer: D
Explanation:
Monitoring of Database Operations requires that theSTATISTICS_LEVELparameter be set toALLand CONTROL_MANAGEMENT_PACK_ACCESSbe set toDIAGNOSTIC+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 # 18
Examine this output of a query of VSPGA_TAPGET_ADVICE:
Which statements is true'
Answer: B
Explanation:
The V$PGA_TARGET_ADVICE view provides advice on potential performance improvements by adjusting the PGA_AGGREGATE_TARGET parameter. The column ESTD_OVERALLOC_COUNT indicates the estimated number of work areas that would perform multiple passes if the PGA_AGGREGATE_TARGET were set to the size in the TARGET_MB column.
A: According to the output, at the target of 700 MB, the ESTD_OVERALLOC_COUNT is 30. This suggests that if PGA_AGGREGATE_TARGET is set to 700 MB, 30 multipass execution work areas would be required. If we look further down, at the target of 800 MB, the ESTD_OVERALLOC_COUNT is 0, indicating that increasing PGA_AGGREGATE_TARGET to 800 MB or more would eliminate the need for multipass executions, not at 700 MB as initially suggested by the option. Hence, the verified answer derived from the data is slightly nuanced; it should be 800 MB to eliminate all multipass executions.
References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Reference, 19c
NEW QUESTION # 19
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?
Answer: D
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 # 20
......
The clients can use the shortest time to prepare the exam and the learning only costs 20-30 hours. The questions and answers of our 1z1-084 study materials are refined and have simplified the most important information so as to let the clients use little time to learn. The clients only need to spare 1-2 hours to learn our 1z1-084 Study Materials each day or learn them in the weekends. Commonly speaking, people like the in-service staff or the students are busy and don’t have enough time to prepare the exam. Learning our 1z1-084 study materials can help them save the time and focus their attentions on their major things.
Reliable 1z1-084 Study Plan: https://www.actualtestsquiz.com/1z1-084-test-torrent.html
BTW, DOWNLOAD part of ActualTestsQuiz 1z1-084 dumps from Cloud Storage: https://drive.google.com/open?id=1Imwhg_MLVdz56RgKeyL_9uJirm6PrDx0