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우리Itexamdump 사이트에서Oracle 1Z0-084관련자료의 일부 문제와 답 등 샘플을 제공함으로 여러분은 무료로 다운받아 체험해보실 수 있습니다.체험 후 우리의Itexamdump에 신뢰감을 느끼게 됩니다.빨리 우리 Itexamdump의 덤프를 만나보세요.
Oracle 1Z0-084 시험은 성능 튜닝 방법, 성능 튜닝 도구, SQL 튜닝 및 메모리 튜닝을 포함한 다양한 주제를 다룹니다. 또한 시험에는 리소스 관리 및 성과 문제를 진단 및 해결하는 것과 같은 주제가 다룹니다. 이 시험은 여러 언어로 제공되며 60 개의 객관식 질문으로 구성되며 120 분 안에 완료해야합니다. 응시자는 시험에 합격하고 인증을 받으려면 최소 63%의 점수를 얻어야합니다. 인증은 18 개월 동안 유효하며, 후보자는 인증을 유지하기 위해 시험을 재개해야합니다.
오라클 1Z0-084 자격증 시험은 오라클 데이터베이스 19c의 성능 및 튜닝 관리에 중점을 둡니다. 이 시험은 데이터베이스 성능 향상 및 시스템 다운타임 감소 기술을 향상시키고자 하는 전문가들을 대상으로합니다. 1Z0-084 시험은 오라클 데이터베이스 19c 개념과 기술에 대한 좋은 이해를 가진 데이터베이스 관리자, 시스템 엔지니어 및 기술 컨설턴트를 대상으로합니다.
Itexamdump는 우수한 IT인증시험 공부가이드를 제공하는 전문 사이트인데 업계에서 높은 인지도를 가지고 있습니다. Itexamdump에서는 IT인증시험에 대비한 모든 덤프자료를 제공해드립니다. Oracle인증 1Z0-084시험을 준비하고 계시는 분들은Itexamdump의Oracle인증 1Z0-084덤프로 시험준비를 해보세요. 놀라운 고득점으로 시험패스를 도와드릴것입니다.시험에서 불합격하면 덤프비용 전액환불을 약속드립니다.
Oracle 1Z0-084 인증 시험은 Oracle Database 19C와 성능 관리 기능에 대한 강력한 이해가 필요한 어려운 시험입니다. 시험은 2 시간 내에 완료 해야하는 80 개의 객관식 질문으로 구성됩니다. 시험에 합격하려면 응시자는 시험에서 63% 이상을 기록해야합니다. 시험은 공인 테스트 센터 또는 온라인 Proctoring 서비스를 통해 취할 수 있습니다.
질문 # 46
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?
정답：B
설명：
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
질문 # 47
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?
정답：C,D
설명：
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
질문 # 48
Examine this statement and output:
Which three statements are true?
정답：A,C,E
설명：
For this SQL statement and output, we can analyze theEVENTcolumn to understand the type of wait:
B: The event "SQL*Net message from client" typically indicates that the session is waiting for a response from the client. This can be due to a network issue, user response, or an application processing delay.
E: The event "SQL*Net message from client" also implies that the session is idle waiting for the client (a user or an application) to send a request to the server. This event usually indicates that the session is not actively working but is instead waiting for the next command.
F: The wait event "enq: TX - row lock contention" suggests that session 9822 is waiting for a row-level lock held by another session. If the holding session issues a COMMIT or ROLLBACK, the lock will be released, and session 9822 will stop waiting. Since this session is experiencing row lock contention, it implies it's waiting for a specific transaction to complete.
References:
* Oracle Database Reference, 19c
* Oracle Wait Events Documentation
질문 # 49
Which two actions can cause invalidation or loss of one or more results in the SQL Query Result Cache?
정답：B,D
설명：
The SQL Query Result Cache stores the results of queries and PL/SQL function calls for reuse. However, entries in the result cache can be invalidated or lost under certain conditions:
A: Results can be aged out of the cache when the cache becomes full and new results need to be stored. This process ensures that the cache does not exceed its allocated memory and that it contains the most recently used entries.
B: Setting theRESULT_CACHE_MAX_SIZEparameter to 0 will effectively disable the result cache and all cached results will be lost, as Oracle will no longer allocate any memory to the result cache.
References:
* Oracle Database Performance Tuning Guide, 19c
질문 # 50
This error occurred more than four hours ago in the database:
ORA-04036 PGA memory used by the instance exceeds PGA_AGGREGATE_LIMIT
You want to know which process and query were at fault.
Which two views should you use for this purpose?
정답：C,D
설명：
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_HISTORY and DBA_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 the PGA_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
질문 # 51
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