Highly-Praised Oracle Database 19c Performance and Tuning Management Qualification Question Helps You Pass the Oracle Database 19c Performance and Tuning Management Exam Easily

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Oracle 1Z0-084 Exam is a comprehensive test comprising 80 multiple-choice questions that need to be completed within 120 minutes. 1Z0-084 exam is designed to challenge candidates’ expertise in Oracle Database performance tuning, and it includes questions on a wide range of topics, such as query optimization, automatic database tuning, parallel operations, optimizer statistics management, and Oracle Database Resource Manager.

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Oracle 1Z0-084 exam covers a range of topics related to performance and tuning management, including database architecture, memory management, SQL tuning, database monitoring, and performance diagnostics. 1Z0-084 exam is composed of 70 multiple-choice questions that must be completed within 105 minutes. The passing score for 1Z0-084 Exam is 63%, and the exam fee is $245 USD. Successfully passing 1Z0-084 exam provides a valuable credential that demonstrates your proficiency in Oracle database performance and tuning management, which can open up new career opportunities and increase your earning potential.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q20-Q25):

NEW QUESTION # 20
Users complain about slowness and session interruptions. Additional checks reveal the following error in the application log:

Which file has additional information about this error?

A. SQL trace file automatically generated by the error
B. ASH report
C. Alert log
D. Session trace file SQL trace file automatically generated by the error

Answer: C

Explanation:
When an ORA-00060 deadlock error occurs, detailed information about the error and the deadlock graph are dumped into the alert log. This log contains a trace file name that you can use to find additional detailed information about the sessions involved in the deadlock and the SQL statements they were executing.
References:
* Oracle Database Administrator's Guide, 19c
* Oracle Database Error Messages, 19c

NEW QUESTION # 21
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: TM - contention
B. enq: TX - allocate ITL entry
C. enq: SQ - contention
D. enq: HW - contention

Answer: D

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 # 22
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 the creation of SQL Patches
B. recommendations regarding partitioning the tables
C. recommendations regarding the creation of materialized views
D. recommendations regarding the creation of additional indexes
E. recommendations regarding rewriting the SQL statements

Answer: C,D

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 # 23
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. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
B. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.
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. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.
E. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.

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 # 24
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. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
B. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.
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. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.
E. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.

Answer: A,B

NEW QUESTION # 25
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