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Die Oracle 1Z0-084-Zertifizierungsprüfung soll das Wissen und die Fähigkeiten von IT-Fachleuten im Bereich der Datenbankleistung und des Tuning-Managements testen. Diese Zertifizierungsprüfung konzentriert sich speziell auf die Oracle Database 19C, die neueste Version der beliebten Oracle -Datenbanksoftware. Durch die Bestimmung dieser Prüfung können IT -Fachkräfte ihre Fachkenntnisse bei der Verwaltung und Optimierung der Leistung von Oracle -Datenbanken demonstrieren.

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Die Oracle 1Z0-084-Prüfung wurde entwickelt, um die Fähigkeiten von Datenbankadministratoren bei der Verwaltung und Optimierung der Leistung von Oracle Database 19C zu testen. Diese Zertifizierung bestätigt das Wissen und das Fachwissen von Fachleuten im Bereich der Datenbankleistung und des Tuning -Managements. Diese Prüfung dient auch als Voraussetzung für den Oracle Certified Expert, Oracle Database 19C: Performance Tuning Certification.

Oracle Database 19c Performance and Tuning Management 1Z0-084 Prüfungsfragen mit Lösungen (Q46-Q51):

46. 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 Semantic Check
D. SQL Adaptive Execution
E. SQL Transformation

Antwort: E

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

47. Frage
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

A. The SGA size remains unaffected after disabling ASMM.
B. All SGA components excluding fixed SGA and other internal allocations are readjusted immediately after disabling ASMM.
C. All SGA components retain their current sizes at the time of disabling.
D. It requires a database instance restart to take effect.
E. Both SGA_TARGET and SGA_MAX_SIZE must be set to zero.
F. All auto-tuned SGA components are reset to their original user-defined values.

Antwort: A,C

Begründung:
When ASMM is disabled, the sizes of the automatically managed SGA components remain at their current values. ASMM is controlled by theSGA_TARGETparameter. IfSGA_TARGETis set to a non-zero value, ASMM is enabled and Oracle will automatically manage the sizes of the various SGA components. When ASMM is disabled, by settingSGA_TARGETto zero, the SGA components that were automatically sized will retain their current sizes rather than being reset to their original user-defined values. The overall size of the SGA remains the same unless manually changed by modifying individual component sizes or SGA_MAX_SIZE.
References:
* Oracle Database Administration Guide, 19c
* Oracle Database Performance Tuning Guide, 19c

48. Frage
Buffer cache access is too frequent when querying the SALES table. Examine this command which executes successfully:
ALTER TABLE SALES SHRINK SPACE;
For which access method does query performance on sales improve?

A. db file scattered read
B. index range scan
C. db file sequential read
D. index full scan

Antwort: C

Begründung:
The SHRINK SPACE operation compacts the table, which can reduce fragmentation and thus improve performance for sequential reads of the table. This operation could improve full table scans, which are typically associated with db file sequential read wait events.
References:
* Oracle Database Administrator's Guide, 19c

49. Frage
Which two Oracle Database features use database services?

A. Oracle SQL Tuning Advisor
B. Oracle Automatic Reoptimization
C. Oracle Scheduler
D. Database Resource Manager
E. Oracle SQL Performance Management

Antwort: C,D

Begründung:
Database services in Oracle are used to manage how resources are allocated and how workloads are managed within the database. The features that use database services are:
* B (Correct):Database Resource Manager (DBRM) uses services to control resource allocation to different workloads. It ensures that resources are assigned to the most critical tasks first, based on the service associated with the workload.
* E (Correct):Oracle Scheduler can also utilize database services. Jobs in Oracle Scheduler can be assigned to different services to control resource allocation and prioritization.
The other features mentioned are related to SQL performance but do not directly utilize database services in the way Resource Manager and Scheduler do:
* A:Oracle Automatic Reoptimization is a feature that allows the database to automatically improve the execution plan of a SQL statement after it is executed, based on the actual performance metrics, but it does not directly use database services.
* C:Oracle SQL Performance Management involves various components of SQL tuning and monitoring, but it does not use database services to operate.
* D:Oracle SQL Tuning Advisor provides advice on how to tune SQL queries for better performance.
While it can be used in conjunction with services for managing and analyzing workloads, it doesn't use services in its core functionality.
References:
* Oracle Database Administrator's Guide:Administering Services
* Oracle Database Administrator's Guide:Managing Resources with Oracle Database Resource Manager
* Oracle Database Scheduler Developer's Guide:Using the Scheduler

50. Frage
What is the right time to stop tuning an Oracle database?

A. When the I/O is less than 10% of the DB time
B. When all the concurrency waits are eliminated from the Top 10
C. When the buffer cache and library cache hit ratio is above 95%
D. When the allocated budget for performance tuning has been exhausted

Antwort: D

Begründung:
The right time to stop tuning an Oracle database is often determined by the point of diminishing returns - when the cost of further tuning (in terms of time, resources, or money) exceeds the performance benefits gained.
This is often related to the budget allocated for performance tuning.
* A (Correct):When the allocated budget for performance tuning has been exhausted, it may be time to stop tuning unless the benefits of further tuning justify requesting additional budget.
* B (Incorrect):Eliminating all concurrency waits from the Top 10 is an unrealistic goal since some waits are inevitable and can occur due to application design, which might not be possible to eliminate completely.
* C (Incorrect):The buffer cache and library cache hit ratio being above 95% does not necessarily indicate that the database is fully optimized. Hit ratios are not reliable indicators of database performance and should not be used as sole criteria to end tuning efforts.
* D (Incorrect):Having I/O less than 10% of DB time is not a definitive indicator to stop tuning. It is essential to consider the overall performance goals and whether they have been met rather than focusing solely on I/O metrics.
References:
* Oracle Database Performance Tuning Guide:Introduction to Performance Tuning
* Oracle Database 2 Day + Performance Tuning Guide:Understanding the Tuning Process

51. Frage
......

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1Z0-084 Deutsche & 1Z0-084 Lernhilfe

1Z0-084 Lernhilfe - 1Z0-084 Prüfungs-Guide

Oracle Database 19c Performance and Tuning Management 1Z0-084 Prüfungsfragen mit Lösungen (Q46-Q51):

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