1z1-084最新考古題 & 1z1-084指南

如果你正在為如何通過1z1-084考試而煩惱，這是沒有必要，通過最新的考試要點來提供覆蓋率很廣的Oracle 1z1-084擬真試題，幫助考生做好充足的考前準備。NewDumps的目的在于如何提供可以確保考生通過認證的高品質題庫，我們的1z1-084考試練習題和答案準確性高，問題覆蓋面大，不斷的更新和整編出高通過率的Oracle 1z1-084題庫，這也是我們對所有的考生提供的保障。

獲得 Oracle 1Z0-084 認證是展示您在 Oracle 數據庫性能調整方面知識和專業技能的優秀方式。此認證證明您具備在任何情況下維護最優數據庫性能所需的必要技能。此外，此認證提供了各種職業機會，例如擔任數據庫性能分析師的關鍵角色或成為在高性能數據庫環境中開發應用程序的團隊領袖。

Oracle Database 19c Performance and Tuning Management Exam（1Z0-084）是一項特別為Oracle數據庫管理員設計的考試，旨在獲得性能管理和調整認證。要成為Oracle數據庫認證專業人員，必須通過此認證考試。通過考試也意味著您擁有必要的知識和技能來管理和調整Oracle19c數據庫的性能。

>> 1z1-084最新考古題 <<

1z1-084指南，1z1-084 PDF

從專門的考試角度來看，有必要教你關於考試的技巧，你需要智取，不要給你的未來失敗的機會，NewDumps培訓資源是個很了不起的資源網站，包括了Oracle的1z1-084考試材料，研究材料，技術材料。認證培訓和詳細的解釋和答案。考古題網站在近幾年激增，這可能是導致你準備Oracle的1z1-084考試認證毫無頭緒。NewDumps Oracle的1z1-084考試培訓資料是一些專業人士和通過了的考生用實踐證明了的有效的培訓資料，它可以幫助你通過考試認證。

最新的 Oracle Database 19c 1z1-084 免費考試真題 (Q50-Q55):

問題 #50
Which two statements are true about cursor sharing?

A. Setting Cursor_sharing to FORCE can result in a plan that is suboptimal for the majority of values bound to a bind variable when executing a cursor with one or more bind variables.
B. Setting optimizer_capture_sql_plan_baselines to TRUE loads all adaptive plans for the same statement into the cursor cache.
C. Setting cursor_sharing to EXACT prevents Adaptive Cursor Sharing from being used.
D. Adaptive Cursor Sharing guarantees that a suboptimal plan will never be used on any execution of a SQL statement.
E. Adaptive Cursor Sharing requires histograms on filtered columns, used in equality predicates, to allow different execution plans to be generated for statements whose bound values would normally generate different plans at hard parse time.

答案：A,C

解題說明：
A: WhenCursor_sharingis set toFORCE, Oracle tries to avoid hard parses by replacing literals in SQL statements with bind variables, even if the original statement didn't include bind variables. This can lead to the use of a single execution plan for multiple executions of a statement with different literal values, which might not be optimal for all executions.
D: Settingcursor_sharingtoEXACTensures that SQL statements must match exactly for them to share a cursor. This setting prevents the use of Adaptive Cursor Sharing (ACS) since ACS relies on the ability to share cursors among similar statements that differ only in their literal values. WithEXACT, there's no cursor sharing for statements with different literals, hence no opportunity for ACS to operate.
References:
* Oracle Database SQL Tuning Guide, 19c
* Oracle Database Reference, 19c

問題 #51
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. SQL Performance Analyzer
B. SQL Tuning Advisor
C. AWR Compare Periods report
D. Active Session History report

答案：D

解題說明：
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

問題 #52
A Standard Edition production database has performance problems for two hours on the same day each week.
Which tool must you use to diagnose the problem?

A. SQL Performance Analyzer
B. Statspack report
C. AWR Compare Periods report
D. Database Replay

答案：B

解題說明：
For a Standard Edition production database, the Statspack tool is available to diagnose performance problems.
The Automatic Workload Repository (AWR) and its related tools like AWR Compare Periods report and SQL Performance Analyzer are features of the Oracle Database Enterprise Edition and are not available in Standard Edition. Database Replay is also a feature of the Enterprise Edition. Statspack is a performance diagnostic tool provided for earlier versions and Standard Editions of the Oracle Database to collect, store, and analyze performance data.
References
* Oracle Database 19c Administrator's Guide - Using Statspack to Diagnose Database Performance Issues

問題 #53
An Oracle 19c database uses default values for all optimizer initialization parameters.
After a table undergoes partition maintenance, a large number of wait events occur for:
cursor: pin S wait on X
Which command reduces the number of these wait events?

A. ALTER SYSTEM SET CURSOR_SPACE_FOR_TIME - TRUE;
B. ALTER SYSTEM SET CURSOR_INVALIDATION = DEFERRED;
C. ALTER SYSTEM SET CURSOR_SHARING = FORCE;
D. ALTER SYSTEM SET SESSION CACHED CURSORS = 500;

答案：B

解題說明：
Thecursor: pin S wait on Xwait event suggests contention for a cursor pin, which is associated with mutexes (a type of locking mechanism) that protect the library cache to prevent concurrent modifications. This issue can often be alleviated by deferring the invalidation of cursors until the end of the call to reduce contention.
The correct command to use would be:
* C (Correct):ALTER SYSTEM SET CURSOR_INVALIDATION=DEFERRED;This setting defers the invalidation of dependent cursors until the end of the PL/SQL call, which can reduce thecursor: pin S wait on Xwait events.
The other options are incorrect in addressing this issue:
* A (Incorrect):SettingCURSOR_SHARINGtoFORCEmakes the optimizer replace literal values with bind variables. It doesn't address the contention for cursor pins directly.
* B (Incorrect):CURSOR_SPACE_FOR_TIME=TRUEaims to reduce the parsing effort by keeping cursors for prepared statements open. It may increase memory usage but does not directly resolve cursor: pin S wait on Xwaits.
* D (Incorrect):IncreasingSESSION_CACHED_CURSORScaches more session cursors but doesn't necessarily prevent the contention indicated by thecursor: pin S wait on Xwait events.
References:
* Oracle Database Reference:CURSOR_INVALIDATION
* Oracle Database Performance Tuning Guide:Reducing Cursor Invalidation

問題 #54
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 size of MEMORYTARGET
B. increasing the value of DB_FILE_MULTIBLOCK_READ_COUNT to 128
C. increasing the value of DBWRITERPROCESSES to 64,
D. reducing the values of DB_FILE_MULTILOCK_READ_COUNT to 64
E. setting dbwr_io_slaves to 64

答案：C,E

解題說明：
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

問題 #55
......

我們NewDumps Oracle的1z1-084考題是的100%通過驗證和測試的，是通過認證的專家，我們NewDumps Oracle 的1z1-084的考試練習題及答案是通過實踐檢驗的軟體和它最終的認證準備培訓工具。在NewDumps中，你會發現最好的認證準備資料，這些資料包括練習題及答案，我們的資料有機會讓你實踐問題，最終實現自己的目標通過 Oracle的1z1-084考試認證。

1z1-084指南: https://www.newdumpspdf.com/1z1-084-exam-new-dumps.html

Mark Bell Mark Bell

Biography

1z1-084最新考古題 & 1z1-084指南

1z1-084指南，1z1-084 PDF

最新的 Oracle Database 19c 1z1-084 免費考試真題 (Q50-Q55):

Quick Links

Resources

Support