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1Z0-084 Musterprüfungsfragen - 1Z0-084Zertifizierung & 1Z0-084Testfagen

Die Schulungsunterlagen zur Oracle 1Z0-084 Zertifizierungsprüfung von unserem ZertSoft können Ihre Kenntnisse während der Vorbereitungszeit prüfen und auch Ihre Leistungen innerhalb bestimmten Zeit bewerten. Unsere Schulungsunterlagen zur Oracle 1Z0-084 Zertifizierungsprüfung sind das Ergebnis der langjährigen ständigen Untersuchung und Erforschung von den erfahrenen IT-Experten aus ZertSoft. Ihre Autorität ist über jeden Zweifel erhaben. Wenn Sie noch Befürchtungen haben, können Sie die kostenlose Demo herunterladen, dann entscheiden Sie sich, ob Sie ZertSoft wählen.

Die Oracle 1Z0-084 (Oracle Database 19c Performance and Tuning Management) Zertifizierungsprüfung ist eine professionelle Zertifizierungsprüfung, die von Oracle angeboten wird, um die Fähigkeiten und Kenntnisse von Einzelpersonen in der Performance- und Tuning-Verwaltung von Oracle Database 19c zu validieren. Die Prüfung ist für Fachleute konzipiert, die mit Oracle Database-Administratoren, Datenbankentwicklern und anderen IT-Profis zusammenarbeiten, die für die Gesamtleistung einer Oracle Database 19c-Umgebung verantwortlich sind. Die Prüfung testet das Wissen des Kandidaten zu verschiedenen Themen wie Datenbankarchitektur, SQL-Tuning, Leistungsanalyse und Best Practices für Leistungstuning.

Die Oracle 1Z0-084 Zertifizierungsprüfung ist eine essentielle Zertifizierung für Personen, die mit der Oracle Datenbank 19c arbeiten. Sie prüft ihr Wissen und ihre Fähigkeiten im Bereich Performance Tuning und Management und durch das Bestehen dieser Prüfung können Personen ihre Expertise in diesem Bereich validieren. Indem sie diese Prüfung bestehen, können Einzelpersonen ihre Karrieremöglichkeiten steigern und ihre Kompetenz im Oracle Database 19c Performance- und Tuning-Management demonstrieren.

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Jeder hat seinen eigenen Lebensplan. Wenn Sie andere Wahle treffen, bekommen Sie sicher etwas Anderes. So ist die Wahl serh wichtig. Die Schulungsunterlagen zur Oracle 1Z0-084 Zertifizierungsprüfung von ZertSoft ist eine beste Methode, die den IT-Fachleuten helfen, ihr Ziel zu erreichen. Sie enthalten Prüfungsfragen und Antworten zur Oracle 1Z0-084 Zertifizierung. Und sie sind den echten Prüfungen ähnlich. Es ist wirklich die besten Schulungsunterlagen.

Oracle Database 19c Performance and Tuning Management 1Z0-084 Prüfungsfragen mit Lösungen (Q27-Q32):

27. Frage
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 60% cache hit ratio can be observed for database instances which have very good I/O performance.
C. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
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. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.

Antwort: A,C

Begründung:
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

28. Frage
You must configure and enable Database Smart Flash Cache for a database.
You configure these flash devices:

Examine these parameter settings:

What must be configured so that the database uses these devices for the Database Smart Flash Cache?

A. Set DB_FLASH_CACHE_SIZE to 256G and change device /dev/sdk to 128G.
B. Disable Automatic Memory Management and set SGA_TARGET to 256G.
C. Set DB_FLASH_CACHE_SIZE parameter to 192G.
D. Set DB_FLASH_CACHE_SIZE parameter to 128G, 64G.
E. Set DB_FLASH_CACHE_SIZE to 192G and MEMORY_TARGET to 256G.

Antwort: D

Begründung:
To configure and enable Database Smart Flash Cache, you must set the DB_FLASH_CACHE_SIZE parameter to reflect the combined size of the flash devices you intend to use for the cache. In this scenario, two flash devices are configured: /dev/sdj with 128G and /dev/sdk with 64G.
* Determine the combined size of the flash devices intended for the Database Smart Flash Cache. In this case, it's 128G + 64G = 192G.
* However, Oracle documentation suggests setting DB_FLASH_CACHE_SIZE to the exact sizes of the individual devices, separated by a comma when multiple devices are used.
* Modify the parameter in the database initialization file (init.ora or spfile.ora) or using an ALTER SYSTEM command. Here's the command for altering the system setting:
ALTER SYSTEM SET DB_FLASH_CACHE_SIZE='128G,64G' SCOPE=SPFILE;
* Since this is a static parameter, a database restart is required for the changes to take effect.
* Upon database startup, it will allocate the Database Smart Flash Cache using the provided sizes for the specified devices.
It is important to note that MEMORY_TARGET and MEMORY_MAX_TARGET parameters should be configured independently of DB_FLASH_CACHE_SIZE. They control the Oracle memory management for the SGA and PGA, and do not directly correlate with the flash cache configuration.
References
* Oracle Database 19c Documentation on Database Smart Flash Cache
* Oracle Support Articles and Community Discussions on DB_FLASH_CACHE_SIZE Configuration

29. Frage
SGA_TARGET and PGA_AGGREGATE_TARGET are configured to nonzero values.
MEMORY_target is then set to a nonzero value but memory_MAX_TARGET is not set.
Which two statements are true?

Antwort: E,G

Begründung:
When MEMORY_TARGET is set to a nonzero value, Oracle automatically manages the memory allocation between the System Global Area (SGA) and the Program Global Area (PGA). If MEMORY_MAX_TARGET is not explicitly set, Oracle will behave in the following manner:
* MEMORY_MAX_TARGET will default to the value of MEMORY_TARGET, assuming the platform allows for the value of MEMORY_TARGET to be increased dynamically. This means that MEMORY_TARGET represents both the initial allocation and the maximum limit for the dynamically managed memory unless MEMORY_MAX_TARGET is specified differently.
* If MEMORY_TARGET is set to a value that is less than the sum of the current values of SGA_TARGET and PGA_AGGREGATE_TARGET, Oracle will use the higher sum as the default value for MEMORY_MAX_TARGET to ensure that there is adequate memory for both areas. The database instance will not start if MEMORY_TARGET is not sufficient to accommodate the combined SGA and PGA requirements.
References
* Oracle Database Administrator's Guide 19c: Automatic Memory Management
* Oracle Database Performance Tuning Guide 19c: Using Automatic Memory Management

30. Frage
Which two types of performance problems are reported by ADDM for PDBS?

A. I/O capacity limits
B. User I/O waits
C. Top SQL statements
D. SGA sizing issues
E. Excessive checkpoint writes

Antwort: A,B

Begründung:
The Automatic Database Diagnostic Monitor (ADDM) analyzes and reports on various types of performance problems. For Pluggable Databases (PDBs), it can identify issues such as I/O capacity limits which may hinder the overall performance by causing bottlenecks. Additionally, ADDM can report on user I/O waits, which can indicate performance issues related to the time it takes for user queries to read data from the disk.
References:
* Oracle Multitenant Administrator's Guide, 19c
* Oracle Database Performance Tuning Guide, 19c

31. Frage
Examine this statement and its corresponding execution plan:

Which phase introduces the CONCATENATION step?

A. SQL Execution
B. SQL Row Source Generation
C. SQL Transformation
D. SQL Adaptive Execution
E. SQL Semantic Check

Antwort: C

Begründung:
The CONCATENATION step in an execution plan is introduced during the SQL Transformation phase. This phase is part of the optimizer's query transformations which can include various techniques to rewrite the query for more efficient execution. The CONCATENATION operation is used to combine the results of two separate SQL operations, typically when there is an OR condition in the WHERE clause, as seen in the provided query.
References:
* Oracle Database SQL Tuning Guide, 19c
* Oracle Database Concepts, 19c

32. Frage
......

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1Z0-084 Schulungsunterlagen: https://www.zertsoft.com/1Z0-084-pruefungsfragen.html

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