B哥外贸独立站

Peter Johnson, Peter Johnson

0 Course Enrolled • 0 Course Completed

Biography

Oracle 1Z0-084 Sample Questions Pdf, 1Z0-084 Useful Dumps

Do you want to obtain your certificate as quickly as possible? If you do, just choose us. You can get your downloading link within ten minutes after your payment for 1Z0-084 training materials, and you can start your learning as quickly as possible. In addition, 1Z0-084 training materials of us are high quality, and you just need to spend 48 to 72 hours on practicing, and you can pass the exam successfully. If you have any questions about the 1Z0-084 Exam Dumps, just contact us, we will give you reply as soon as possible.

To prepare for the Oracle 1Z0-084 certification exam, candidates should have experience with Oracle Database 19c and a solid understanding of performance tuning concepts. There are many resources available to help candidates prepare for the exam, including study guides, practice exams, and training courses. With the right preparation and experience, candidates can demonstrate their proficiency in managing and tuning Oracle databases and earn the Oracle 1Z0-084 certification.

Oracle 1Z0-084 exam consists of 70 multiple-choice questions that must be completed within 105 minutes. 1Z0-084 Exam covers a wide range of topics, including database architecture, instance tuning, SQL tuning, memory management, and performance monitoring. Candidates must have a thorough understanding of Oracle Database 19c, as well as experience with performance tuning and management tools such as Automatic Workload Repository (AWR), Automatic Database Diagnostic Monitor (ADDM), and Enterprise Manager Cloud Control.

>> Oracle 1Z0-084 Sample Questions Pdf <<

1Z0-084 Useful Dumps, Reliable 1Z0-084 Exam Answers

Getting the Oracle Database 19c Performance and Tuning Management (1Z0-084) certification will highly expand your expertise. To achieve the 1Z0-084 certification you need to prepare well. 1Z0-084 exam dumps are a great way to assess your skills and abilities. 1Z0-084 Questions can help you identify your strengths and weaknesses and better understand what you're good at. You should take a 1Z0-084 Practice Exam to prepare for the Oracle Database 19c Performance and Tuning Management (1Z0-084) certification exam. With 1Z0-084 exam preparation software, you can practice your skills and improve your performance.

Oracle 1Z0-084 exam is designed to test a candidate's knowledge and skills in managing and tuning the performance of an Oracle Database 19c system. 1Z0-084 exam is intended for database administrators, performance analysts, and technical consultants who are responsible for ensuring the optimal performance of Oracle Database systems. 1Z0-084 Exam covers a range of topics, including database architecture, memory management, SQL tuning, and system troubleshooting.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q39-Q44):

NEW QUESTION # 39
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

A. reducing the values of DB_FILE_MULTILOCK_READ_COUNT to 64
B. Increasing the size of MEMORYTARGET
C. increasing the value of DBWRITERPROCESSES to 64,
D. setting dbwr_io_slaves to 64
E. increasing the value of DB_FILE_MULTIBLOCK_READ_COUNT to 128

Answer: C,D

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 the DBWR_IO_SLAVES parameter 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 of DBWRITERPROCESSES enables 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 # 40
Multiple sessions are inserting data concurrently into a table that has an LOB column.
At some point in time, one of the sessions cannot find available space in the LOB segment and needs to allocate a new extent.
Which wait event will be raised in the other sessions that need space in the LOB column?

A. enq: TX - allocate ITL entry
B. enq: TM - contention
C. enq: HW - contention
D. enq: SQ - contention

Answer: C

Explanation:
When sessions concurrently insert data into a table with an LOB column and one session needs to allocate a new extent because it cannot find available space, the wait event associated with this contention is "enq: HW - contention". The HW stands for High Water Mark which is related to space allocation in the database segment.
When asession needs to allocate a new extent, it may raise this wait event in other sessions that are also attempting to allocate space in the same LOB segment.
References
* Oracle Database 19c Reference Guide - enq: HW - contention

NEW QUESTION # 41
Which two Oracle Database features use database services?

A. Oracle Automatic Reoptimization
B. Oracle Scheduler
C. Oracle SQL Tuning Advisor
D. Oracle SQL Performance Management
E. Database Resource Manager

Answer: B,E

Explanation:
Database services in Oracle are used to manage how resources are allocated and how workloads are managed within the database. The features that use database services are:
* B (Correct):Database Resource Manager (DBRM) uses services to control resource allocation to different workloads. It ensures that resources are assigned to the most critical tasks first, based on the service associated with the workload.
* E (Correct):Oracle Scheduler can also utilize database services. Jobs in Oracle Scheduler can be assigned to different services to control resource allocation and prioritization.
The other features mentioned are related to SQL performance but do not directly utilize database services in the way Resource Manager and Scheduler do:
* A:Oracle Automatic Reoptimization is a feature that allows the database to automatically improve the execution plan of a SQL statement after it is executed, based on the actual performance metrics, but it does not directly use database services.
* C:Oracle SQL Performance Management involves various components of SQL tuning and monitoring, but it does not use database services to operate.
* D:Oracle SQL Tuning Advisor provides advice on how to tune SQL queries for better performance.
While it can be used in conjunction with services for managing and analyzing workloads, it doesn't use services in its core functionality.
References:
* Oracle Database Administrator's Guide:Administering Services
* Oracle Database Administrator's Guide:Managing Resources with Oracle Database Resource Manager
* Oracle Database Scheduler Developer's Guide:Using the Scheduler

NEW QUESTION # 42
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 partitioning the tables
C. recommendations regarding the creation of additional indexes
D. recommendations regarding the creation of SQL Patches
E. recommendations regarding the creation of materialized views

Answer: C,E

Explanation:
The SQL Tuning Advisor provides recommendations for improving SQL query performance. This may include suggestions for creating additional indexes to speed up data retrieval and materialized views to precompute and store query results.References:
* Oracle Database SQL Tuning Guide, 19c

NEW QUESTION # 43
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 sorted in order of index IX_SALES_TIME_ID.
B. Re-create the SALES table using the columns in IX_SALES_TIME_ID as the hash partitioning key.
C. Re-create index IX_SALES_TIME_ID using ADVANCED COMPRESSION.
D. Partition index IX_SALES_TIME_ID using hash partitioning.

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 # 44
......

1Z0-084 Useful Dumps: https://www.certkingdompdf.com/1Z0-084-latest-certkingdom-dumps.html

Peter Johnson, Peter Johnson

Biography

掌握建站、优化、引流技巧

订单详情

课程链接

扫码即时咨询