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Oracle 1z1-084受験記対策 & 1z1-084日本語受験教科書

1z1-084試験問題は、シラバスの変更および理論と実践の最新の進展に応じて完全に改訂および更新されます。高品質の製品を提供するために、1z1-084テストガイドを慎重に準備します。製品のすべての改訂と更新により、1z1-084ガイドトレントに関する正確な情報を取得でき、大多数の学生が簡単に習得でき、重要な情報の内容を簡素化できます。当社の製品1z1-084テストガイドは、より重要な情報をより少ない質問と回答で提供します。

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>> Oracle 1z1-084受験記対策 <<

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この試験は、パフォーマンスの問題の特定と解決、パフォーマンスチューニング戦略の実装、データベースパフォーマンスの監視と診断、メモリ、ストレージ、CPUなどのリソースの管理など、幅広いトピックをカバーしています。さらに、候補者は、Oracleデータベースアーキテクチャ、SQLチューニング、バックアップとリカバリ、セキュリティについて深い理解を持っていることが期待されています。この認定は、業界で高く評価され、複雑なOracleデータベースシステムの管理における個人の専門知識と経験の強力な指標となることがよくあります。

試験は60問の選択問題から成り、105分以内に回答する必要があります。問題はシステムインフラストラクチャ、データベースパフォーマンス管理、データベースパフォーマンスの最適化の3つのセクションに分かれています。受験者は、最低63％（60問中38問以上）のスコアを取得する必要があります。Oracleは、受験前にデータベース管理または開発の関連する経験を少なくとも2年間持っていること、およびOracle Database 19cの経験を持っていることを推奨しています。適切な学習ツールと経験を持っている場合、受験者はOracle 1Z0-084試験に対して準備し、合格することができます。そして、パフォーマンスとチューニング管理の専門技術を証明することができます。

Oracle Database 19c Performance and Tuning Management 認定 1z1-084 試験問題 (Q33-Q38):

質問 # 33
Examine this code block, which executes successfully:
DBMS_SERVER_ALERT. SET_THRESHOLD (
DBMS_SERVER_ALERT.CPU_TIME_PER_CALL, DBMS_SERVER_ALERT. OPERATOR_GE, '8000', DBMS_SERVER_ALERT.OPERATOR_GE, '10000', 1, 2, 'inst1', DBMS_SERVER_ALERT.OBJECT_TYPE_SERVICE, 'main.regress.rdbms.dev.us.example.com') ;

What will happen?

A. A critical alert will be issued when CPU time exceeds 10000 microseconds for each user call.
B. A critical alert will be issued when CPU time exceeds 2 minutes for each user call.
C. A warning alert will be issued when CPU time exceeds 1 minute for each user call.
D. A warning alert will be issued only when CPU time exceeds 10000 microseconds for each user call.

正解：A

解説：
In the provided code block, theDBMS_SERVER_ALERT.SET_THRESHOLDprocedure is used to set alert thresholds for the CPU time per call in Oracle Database. This procedure is a part of Oracle's Database Server Alert system, which monitors various metrics and generates alerts when certain thresholds are exceeded.
The parameters passed to theSET_THRESHOLDprocedure are as follows:
* The first parameterDBMS_SERVER_ALERT.CPU_TIME_PER_CALLspecifies the metric for which the threshold is being set, in this case, the CPU time consumed per database call.
* The second and third parametersDBMS_SERVER_ALERT.OPERATOR_GEand'8000'specify the warning threshold level and its value, respectively. However, these are not relevant to the answer as they are overridden by the critical threshold settings.
* The fourth and fifth parametersDBMS_SERVER_ALERT.OPERATOR_GEand'10000'set the critical threshold level and its value. This means that a critical alert will be generated when the CPU time per call exceeds 10000 microseconds.
* The remaining parameters specify the warning and critical alert intervals, the instance name, the object type, and the service name. These are not directly relevant to the behavior described in the options.
Thus, the correct answer is B, as the critical threshold for CPU time per call is set to 10000 microseconds, and the system is configured to issue a critical alert when this threshold is exceeded.
References:
* Oracle Database 19c documentation on theDBMS_SERVER_ALERT.SET_THRESHOLDprocedure, which details the parameters and usage of this procedure for setting alert thresholds within Oracle Database monitoring system.
* Oracle Database Performance Tuning Guide, which provides best practices and methodologies for monitoring and tuning Oracle Database performance, including the use of server alerts and thresholds.

質問 # 34
Which three statements are true about using the in Memory (IM) column store?

A. It does not improve performance for queries that use join groups on columns from different tables.
B. It improves performance for queries joining several tables using bloom filter joins.
C. It does not improve performance for queries using user-defined virtual column results.
D. It does not improve performance for queries using cached results of function evaluations on columns from the same table.
E. It can improve OLTP workload performance by avoiding the use of indexes.
F. It does not require all database data to fit in memory to improve query performance.

正解：B、E、F

解説：
The Oracle In-Memory (IM) column store feature enhances the performance of databases by providing a fast columnar storage format for analytical workloads while also potentially benefiting OLTP workloads.
* C (True):It can improve OLTP workload performance by providing a faster access path for full table scans and reducing the need for indexes in certain scenarios, as the In-Memory store allows for efficient in-memory scans.
* E (True):The In-Memory column store does not require all database data to fit in memory. It can be used selectively for performance-critical tables or partitions, and Oracle Database will manage the population and eviction of data as needed.
* F (True):In-Memory column store can significantly improve performance for queries joining several tables, especially when bloom filters are used, as they are highly efficient with the columnar format for large scans and join processing.
The other options provided are not correct in the context of the In-Memory column store:
* A (False):While In-Memory column store is designed for analytical queries rather than caching results of function evaluations, it does not specifically avoid improving performance for queries using cached results of function evaluations.
* B (False):In-Memory column store can improve the performance of queries that use join groups, which can be used to optimize joins on columns from different tables.
* D (False):In-Memory column store can improve the performance of queries using expressions, including user-defined virtual columns, because it supports expression statistics which help in
* optimizing such queries.
References:
* Oracle Database In-Memory Guide:In-Memory Column Store in Oracle Database
* Oracle Database In-Memory Guide:In-Memory Joins
* Oracle Database In-Memory Guide:In-Memory Aggregation

質問 # 35
Which Optimizer component helps decide whether to use a nested loop join or a hash join in an adaptive execution plan?

A. Statistics Collector
B. Dynamic Statistics
C. Statistics Feedback
D. SQL Plan Directives
E. Automatic Reoptimization

正解：A

解説：
In an adaptive execution plan, the Optimizer makes runtime decisions between nested loop and hash joins using a statistics collector. The collector is a row source that collects statistics about the rows it processes and can adapt the plan based on the number of rows processed.
References:
* Oracle Database SQL Tuning Guide, 19c

質問 # 36
Which two options are part of a Soft Parse operation?

A. Syntax Check
B. Semantic Check
C. Shared Pool Memory Allocation
D. SQL Optimization
E. SQL Row Source Generation

正解：B

質問 # 37
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 DB_FILE_MULTIBLOCK_READ_COUNT to 128
B. setting dbwr_io_slaves to 64
C. Increasing the size of MEMORYTARGET
D. reducing the values of DB_FILE_MULTILOCK_READ_COUNT to 64
E. increasing the value of DBWRITERPROCESSES to 64,

正解：B、E

解説：
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 theDBWR_IO_SLAVESparameter 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 ofDBWRITERPROCESSESenables 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

質問 # 38
......

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