1z1-084 Valid Dumps Free - 1z1-084 Exam Voucher
What's more, part of that ITExamSimulator 1z1-084 dumps now are free: https://drive.google.com/open?id=19Tw0038YP6epR89KuefFaSiqiTU_CN9A
In fact, our 1z1-084 study materials are not expensive at all. The prices of the 1z1-084 exam questions are reasonable and affordable while the quality of them are unmatched high. So with minimum costs you can harvest desirable outcomes more than you can imagine. By using our 1z1-084 Training Materials you can gain immensely without incurring a large amount of expenditure. And we give some discounts on special festivals.
Free domo for 1z1-084 exam materials is available, we recommend you to have a try before buying 1z1-084 exam dumps, so that you can have a deeper understanding of what you are going to buy. 1z1-084 training materials contain both questions and answers, and you can have a quickly check after practicing. We have a professional team to collect and research the latest information for the exam, and you can receive the latest information for 1z1-084 Exam Dumps if you choose us. We have online and offline service for 1z1-084 exam dumps, and the staff possesses the professional knowledge for the exam, if you have any questions, you can consult us.
>> 1z1-084 Valid Dumps Free <<
1z1-084 Exam Voucher - Exam 1z1-084 Syllabus
To other workers who want to keep up with the time and being competent in today’s world, you are also looking for some effective 1z1-084 exam prep as well. Without voluminous content to remember, our 1z1-084 practice materials contain what you need to know and what the exam want to test, So our 1z1-084 Real Exam far transcend others in market. We never avoid our responsibility of offering help for exam candidates like you, so choosing our 1z1-084 training guide means you choose success.
Oracle 1Z0-084 exam is a comprehensive test that covers a wide range of topics related to database performance and tuning management. 1z1-084 exam covers topics such as SQL tuning, database architecture, memory management, performance tuning tools, and performance tuning methodologies. 1z1-084 Exam also covers advanced topics such as tuning database partitioning, tuning parallel execution, and tuning the database buffer cache.
Oracle Database 19c Performance and Tuning Management Sample Questions (Q24-Q29):
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?
Answer: A,E
NEW QUESTION # 25
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 # 26
Examine this output of a query of VSPGA_TAPGET_ADVICE:
Which statements is true'
Answer: D
Explanation:
The query output from V$PGA_TARGET_ADVICE provides tuning information for the PGA (Program Global Area). Let's break it down step by step:
Key Columns in the Output:
* TARGET_MB:
* Represents the hypothetical PGA_AGGREGATE_TARGET values (in megabytes) evaluated by Oracle.
* CACHE_HIT_PERC:
* The percentage of work areas that could execute in-memory (optimal execution) without requiring temporary disk writes.
* Higher percentages indicate fewer work areas requiring disk I/O.
* ESTD_OVERALLOC_COUNT:
* The estimated number of work areas that need to go to disk (multipass operations or overallocations).
Observations from the Data:
* At TARGET_MB = 700 MB:
* The CACHE_HIT_PERC is 68%.
* The ESTD_OVERALLOC_COUNT is 30. This indicates that some multipass work areas still exist.
* At TARGET_MB = 800 MB:
* The CACHE_HIT_PERC rises to 74%.
* The ESTD_OVERALLOC_COUNT drops to 0. This indicates that no work areas require multipass execution.
* At TARGET_MB = 900 MB and above:
* The CACHE_HIT_PERC increases slightly to 82%-84%.
* The ESTD_OVERALLOC_COUNT remains 0, meaning that all work areas are now either optimal or one-pass.
Why D is Correct:
* At 800 MB or more, the ESTD_OVERALLOC_COUNT is 0, indicating that all one-pass execution work areas are eliminated.
* A one-pass execution requires temporary disk I/O for intermediate results, but with sufficient PGA, these are no longer necessary.
Why Other Options Are Incorrect:
* Option A:
* It mentions all multipass executions work areas would be eliminated at 700 MB. This is incorrect because, at 700 MB, the ESTD_OVERALLOC_COUNT is still 30, indicating some multipass work areas still exist.
* Option B:
* Suggests setting the PGA_AGGREGATE_TARGET to at least 800 MB, which is partially correct but does not address the elimination of one-pass execution.
* Option C:
* Suggests setting the PGA_AGGREGATE_TARGET to at least 700 MB, which is not sufficient to eliminate all one-pass executions, as shown by the ESTD_OVERALLOC_COUNT of 30.
NEW QUESTION # 27
This error occurred more than four hours ago in the database:
ORA-04036 PGA memory used by theinstance exceedsPGA_AGGREGATE_LIMIT
You want to know which process and query were at fault.
Which two views should you use for this purpose?
Answer: B,C
Explanation:
To investigate the cause of the ORA-04036 error, which indicates that PGA memory usage exceeds the PGA_AGGREGATE_LIMIT, the appropriate views to consult are DBA_HIST_ACTIVE_SESS_HISTORYandDBA_HIST_PROCESS_MEM_SUMMARY.
* DBA_HIST_ACTIVE_SESS_HISTORY:This view provides historical information about active sessions in the database. It includes details about the SQL executed, the execution context, and the resources consumed by each session. By examining this view, you can identify the specific sessions and SQL queries that were active and potentially consuming excessive PGA memory around the time the ORA-04036 error occurred.
* DBA_HIST_PROCESS_MEM_SUMMARY:This view contains historical summaries of memory usage by processes. It can help in identifying the processes that were consuming a significant amount of PGA memory, leading to the ORA-04036 error. This view provides aggregated memory usage information over time,making it easier to pinpoint the processes responsible for high PGA memory consumption.
Together, these views offer a comprehensive overview of the memory usage patterns and specific queries or processes that might have contributed to exceeding thePGA_AGGREGATE_LIMIT, resulting in the ORA-04036 error.
References:
* Oracle Database Reference:DBA_HIST_ACTIVE_SESS_HISTORY
* Oracle Database Reference:DBA_HIST_PROCESS_MEM_SUMMARY
* Oracle Database Performance Tuning Guide:Managing Memory
NEW QUESTION # 28
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: A,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 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 # 29
......
Our 1z1-084 study materials have a high quality which is mainly reflected in the pass rate. Our product can promise a higher pass rate than other study materials. 99% people who have used our 1z1-084 study materials passed their exam and got their certificate successfully, it is no doubt that it means our 1z1-084 Study Materials have a 99% pass rate. So our product will be a very good choice for you. If you are anxious about whether you can pass your exam and get the certificate, we think you need to buy our 1z1-084 study materials as your study tool, our product will lend you a good helping hand.
1z1-084 Exam Voucher: https://www.itexamsimulator.com/1z1-084-brain-dumps.html
BTW, DOWNLOAD part of ITExamSimulator 1z1-084 dumps from Cloud Storage: https://drive.google.com/open?id=19Tw0038YP6epR89KuefFaSiqiTU_CN9A
