1Z0-084日本語復習赤本、1Z0-084予想試験

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Oracle 1Z0-084 認定は、プロフェッショナルがOracle Database 19cのパフォーマンスとチューニング管理におけるスキルと知識を向上させる優れた方法です。この認定は、グローバルに認められ、IT業界において貴重な資産と見なされています。1Z0-084 認定を持つプロフェッショナルは、データベースのパフォーマンスを最適化し、システムの可用性を確保し、システムのダウンタイムを削減するという専門知識と信頼性を証明することができます。全体的に、Oracle 1Z0-084 認定は、データベース管理のキャリアを進めたいプロフェッショナルにとって、優れた投資です。

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Oracle Database 19c Performance and Tuning Management 認定 1Z0-084 試験問題 (Q43-Q48):

質問 # 43
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. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.
B. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
C. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.
D. The performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.
E. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.

正解：A、B

解説：
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

質問 # 44
Examine this statement and output:

Which three statements are true?

A. Session 8779 may be waiting due to a network problem.
B. Session 8779 may be waiting for a user or application response.
C. Session 9857 is not waiting.
D. Both 9822 and 8779 sessions are waiting for operating system resources.
E. Session 9857 waited 1354 seconds for another process, which was also waiting for a transaction to end.
F. Session 9822 will always stop waiting if the session that owns the TX enqueue issues a COMMIT statement as session 9822 is the first session in the transaction queue.

正解：A、B、F

解説：
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

質問 # 45
Which two actions can cause invalidation or loss of one or more results in the SQL Query Result Cache?

A. Decreasing the value set for RESULT_CACHE_REMOTE_EXPIRATION.
B. A request was made by the RCBG background process in a physical standby database that is opened read only and whose primary has a result cache.
C. A request was made by the RCBG background of a non-RAC database.
D. One or more results were aged out of the result cache.
E. result_cache_max_size is set dynamically to 0.

正解：D、E

解説：
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

質問 # 46
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: HW - contention
B. enq: TX - allocate ITL entry
C. enq: TM - contention
D. enq: SQ - contention

正解：A

解説：
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

質問 # 47
Which statement is true about DB time in V$$YS_TIME_MODEL?

A. DB time is organized as a simple list of statistics and any time period is attributable to only one statistic.
B. DB time can be many times greater than the elapsed time since the database instance started.
C. DB time includes the time spent executing the RMAN backup and restore command.
D. DB tine excludes the time spent waiting for a CPU in the operating system run queue.

正解：B

解説：
DB time includes the time spent on user and background processes. It can be greater than the elapsed time because it accumulates the active time of all the processes. For example, if two sessions are each active for 2 seconds at the same time, DB time would accumulate 4 seconds, while the elapsed time would be only 2 seconds.References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Reference, 19c

質問 # 48
......

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1Z0-084日本語復習赤本、1Z0-084予想試験

ハイパスレート-効率的な1Z0-084日本語復習赤本試験-試験の準備方法1Z0-084予想試験

Oracle Database 19c Performance and Tuning Management 認定 1Z0-084 試験問題 (Q43-Q48):

更新する1Z0-084日本語復習赤本 & 合格スムーズ1Z0-084予想試験 | 最高の1Z0-084最速合格

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