VCEEngine Oracle 1Z0-084 Exam Real and Updated Dumps are Ready for Download

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Oracle 1Z0-084 exam covers a wide range of topics related to performance tuning, including database architecture, SQL tuning, memory management, and troubleshooting. 1Z0-084 exam is designed to test the candidate's ability to identify and resolve performance issues in an Oracle Database environment. 1Z0-084 exam consists of multiple-choice questions and requires a passing score of 63%.

Oracle 1Z0-084 Certification Exam covers all aspects of Oracle Database 19c Performance and Tuning Management, including the most effective tuning methodologies, tools, and techniques used to optimize the database performance. 1Z0-084 Exam validates a candidate’s ability to identify and understand the underlying problems in a database and provide the best solution to solve them. Oracle Database 19c Performance and Tuning Management certification exam helps professionals to develop their skill set and their ability to effectively tune and optimize databases in any real-world scenario.

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Oracle 1Z0-084 Exam is designed for professionals who want to enhance their skills and expertise in performance and tuning management of Oracle Database 19c. 1Z0-084 exam covers a wide range of topics related to database performance and tuning management and tests the candidate's ability to use various performance tuning tools and techniques to optimize database performance. Oracle Database 19c Performance and Tuning Management certification is recognized globally and is highly valued by employers, making it an essential certification for professionals in the field of database administration and performance tuning.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q13-Q18):

NEW QUESTION # 13
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. setting dbwr_io_slaves to 64
C. increasing the value of DBWRITERPROCESSES to 64,
D. Increasing the size of MEMORYTARGET
E. increasing the value of DB_FILE_MULTIBLOCK_READ_COUNT to 128

Answer: B,C

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 # 14
Which procedure gathers statistics that are always used in the generation of any execution plan?

A. DBMS_STATS.GATHER_DICTIONARY_STATS
B. DBMS_STATS.GATHER_FIXED_ OBJECTS_STATS
C. DBMS_STATS.GATHER_DATABASE_STATS
D. DBMS_STATS.GATHER_SYSTEM_STATS

Answer: C

Explanation:
TheDBMS_STATS.GATHER_DATABASE_STATSprocedure is used to gather statistics for all schema objects in the database that do not have up-to-date statistics. These statistics are essential for the optimizer to make informed decisions about the most efficient way to execute a query. The procedure collects statistics such as table and column statistics, index statistics, and system statistics, which are all used in the execution plan generation.
References:
* Oracle Database PL/SQL Packages and Types Reference, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 15
Database performance degraded between 23:15 and 23:30 for the last three nights. The awr snapshot interval is one hour. The AODM report contains nothing about this performance problem.
With which tool can you further analyze this problem?

A. AWR Compare Periods report
B. SQL Tuning Advisor
C. SQL Performance Analyzer
D. Active Session History report

Answer: D

Explanation:
The Active Session History (ASH) report is a tool that provides detailed information about active sessions for the time period specified. Since the AWR snapshot interval is one hour and does not capture the granularity needed for this issue, ASH reports aremore suitable as they contain more granular data for sessions that were active during the period of interest.
References:
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 16
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 the creation of additional indexes
C. recommendations regarding the creation of SQL Patches
D. recommendations regarding partitioning the tables
E. recommendations regarding the creation of materialized views

Answer: B,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 # 17
Which two statements are true about the use and monitoring of Buffer Cache Hit ratios and their value in tuning Database I/O performance?

A. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.
B. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
C. The performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.
D. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.
E. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.

Answer: A,B

Explanation:
A high buffer cache hit ratio typically indicates that the database is effectively using the buffer cache and does not often need to read data from disk. However, this metric alone is not a reliable indicator of the I/O performance of the database for several reasons:
* Full table scans and fast full index scans (A) can bypass the buffer cache by design if the blocks are not
* deemed reusable shortly, which can impact the cache hit ratio.
* A high cache hit ratio (B) can be misleading if the database performance is poor due to other factors, such as inefficient queries or contention issues.
* The buffer cache advisory (C) is a more valuable tool for understanding the potential impact of different cache sizes on the database's I/O performance. It simulates scenarios with different cache sizes and provides a more targeted recommendation.
* The RECYCLE and KEEP buffer caches (D) are specialized caches designed for certain scenarios.
While high hit ratios can be beneficial, they are not universally required; some workloads might not be significantly impacted by lower hit ratios in these caches.
* A lower cache hit ratio (E) does not necessarily mean poor I/O performance. In some cases, a system with a well-designed storage subsystem and efficient queries might perform well even with a lower cache hit ratio.
References
* Oracle Database 19c Performance Tuning Guide - Buffer Cache Hit Ratio
* Oracle Database 19c Performance Tuning Guide - v$db_cache_advice

NEW QUESTION # 18
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VCEEngine Oracle 1Z0-084 Exam Real and Updated Dumps are Ready for Download

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q13-Q18):

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