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To obtain the Oracle 1Z0-084 Certification, candidates must have a strong foundational understanding of Oracle Database 19c and be proficient in performance tuning and management techniques. 1Z0-084 exam consists of 70 multiple-choice questions and must be completed within 105 minutes. The passing score for the exam is 63% and candidates must also agree to the Oracle Certification Program policies before receiving their certification.
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Oracle 1Z0-084 certification exam is a valuable credential for professionals seeking to prove their expertise in managing the performance and tuning of Oracle Database 19c. It demonstrates their ability to optimize the performance of the database and ensure that it runs smoothly and efficiently. Oracle Database 19c Performance and Tuning Management certification also shows that they understand how to identify and resolve performance issues quickly and effectively.
Oracle 1Z0-084 Exam is designed for professionals who seek to validate their expertise in performance and tuning management of Oracle Database 19c. Oracle Database 19c Performance and Tuning Management certification exam is intended for database administrators, system administrators, and developers who have experience working with Oracle Database 19c and want to enhance their skills in managing database performance and tuning.
Oracle Database 19c Performance and Tuning Management Sample Questions (Q33-Q38):
NEW QUESTION # 33
What are the least elevated values of statistics_level and C0NTR0LJ4ANAGEMENT_PACK_ACCESS that allow the usage of Monitoring of Database Operations?
- A. STATISTICS_LEVEL=TYPICAL and
CONTROL_MANAGEMENT_PACK_ACCESS-DIAGOSTIC*TUNING
- B. STATISTICS_LEVEL=TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC
- C. STATISTICS_LEVEL=BASIC and CONTROL_MANAGEMENT_PACK ACCESS=DIAGOSTIC
- D. STATISTICS_LEVEL=ALL and
CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC+TUNING
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 # 34
What is the right time to stop tuning an Oracle database?
- A. When the buffer cache and library cache hit ratio is above 95%
- B. When the I/O is less than 10% of the DB time
- C. When the allocated budget for performance tuning has been exhausted
- D. When all the concurrency waits are eliminated from the Top 10
Answer: C
Explanation:
The right time to stop tuning an Oracle database is often determined by the point of diminishing returns - when the cost of further tuning (in terms of time, resources, or money) exceeds the performance benefits gained.
This is often related to the budget allocated for performance tuning.
* A (Correct):When the allocated budget for performance tuning has been exhausted, it may be time to stop tuning unless the benefits of further tuning justify requesting additional budget.
* B (Incorrect):Eliminating all concurrency waits from the Top 10 is an unrealistic goal since some waits are inevitable and can occur due to application design, which might not be possible to eliminate completely.
* C (Incorrect):The buffer cache and library cache hit ratio being above 95% does not necessarily indicate that the database is fully optimized. Hit ratios are not reliable indicators of database performance and should not be used as sole criteria to end tuning efforts.
* D (Incorrect):Having I/O less than 10% of DB time is not a definitive indicator to stop tuning. It is essential to consider the overall performance goals and whether they have been met rather than focusing solely on I/O metrics.
References:
* Oracle Database Performance Tuning Guide:Introduction to Performance Tuning
* Oracle Database 2 Day + Performance Tuning Guide:Understanding the Tuning Process
NEW QUESTION # 35
Buffer cache access is too frequent when querying the SALES table. Examine this command which executes successfully:
ALTER TABLE SALES SHRINK SPACE;
For which access method does query performance on sales improve?
- A. db file scattered read
- B. index full scan
- C. db file sequential read
- D. index range scan
Answer: C
Explanation:
The SHRINK SPACE operation compacts the table, which can reduce fragmentation and thus improve performance for sequential reads of the table. This operation could improve full table scans, which are typically associated with db file sequential read wait events.
References:
* Oracle Database Administrator's Guide, 19c
NEW QUESTION # 36
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. increasing the value of DBWRITERPROCESSES to 64,
- B. setting dbwr_io_slaves to 64
- C. increasing the value of DB_FILE_MULTIBLOCK_READ_COUNT to 128
- D. Increasing the size of MEMORYTARGET
- E. reducing the values of DB_FILE_MULTILOCK_READ_COUNT to 64
Answer: A,B
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 # 37
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. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.
- C. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.
- D. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.
- E. The performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.
Answer: A,D
NEW QUESTION # 38
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