EXAM DUMPS 1Z1-084 COLLECTION - PASSING 1Z1-084 SCORE FEEDBACK

Exam Dumps 1z1-084 Collection - Passing 1z1-084 Score Feedback

Exam Dumps 1z1-084 Collection - Passing 1z1-084 Score Feedback

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Oracle 1Z0-084 exam is focused on assessing a candidate's knowledge and skills in Oracle database 19c performance and tuning management. It is designed for database administrators, performance analysts, and other professionals who are involved in managing the performance of Oracle database systems. Passing 1z1-084 Exam demonstrates that an individual has a comprehensive understanding of the key concepts and techniques required to optimize Oracle database performance and ensure high levels of availability and reliability.

To prepare for the Oracle 1Z0-084 certification exam, candidates should have experience with Oracle Database 19c and a solid understanding of performance tuning concepts. There are many resources available to help candidates prepare for the exam, including study guides, practice exams, and training courses. With the right preparation and experience, candidates can demonstrate their proficiency in managing and tuning Oracle databases and earn the Oracle 1Z0-084 certification.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q23-Q28):

NEW QUESTION # 23
A Standard Edition production database has performance problems for two hours on the same day each week.
Which tool must you use to diagnose the problem?

  • A. AWR Compare Periods report
  • B. Database Replay
  • C. SQL Performance Analyzer
  • D. Statspack report

Answer: D

Explanation:
For a Standard Edition production database, the Statspack tool is available to diagnose performance problems.
The Automatic Workload Repository (AWR) and its related tools like AWR Compare Periods report and SQL Performance Analyzer are features of the Oracle Database Enterprise Edition and are not available in Standard Edition. Database Replay is also a feature of the Enterprise Edition. Statspack is a performance diagnostic tool provided for earlier versions and Standard Editions of the Oracle Database to collect, store, and analyze performance data.
References
* Oracle Database 19c Administrator's Guide - Using Statspack to Diagnose Database Performance Issues


NEW QUESTION # 24
You need to transport performance data from a Standard Edition to an Enterprise Edition database. What is the recommended method to do this?

  • A. Export the data by using expdp from Statspack and import it by using $ORACLE_HOME/rdbms/admin
    /awrload into the AWR repository.
  • B. Export the data by using expdp from the ftatspack repository and import it by using impdp into the AWR repository.
  • C. Export the data by using the expdp utility and parameter file spuexp.par from the Statspack repository and import it by using impdp into Export the data by using expdp from the Statspack repository and import it by using impdp into the AWR repository.
  • D. Export the data by using the exp utility and parameter file spuexp.par from the Statspack repository and import it by using imp into a dedicated Statspack schema on the destination.

Answer: D

Explanation:
To transport performance data from an Oracle Database Standard Edition, which uses Statspack, to an Enterprise Edition database, which uses AWR, you must consider the compatibility of data structures and repository schemas between these tools. The recommended method is:
* D (Correct): Export the data using the exp utility with a parameter file appropriate for Statspack (like spuexp.par) from the Statspack repository and import it into a dedicated Statspack schema on the destination. Since Statspack and AWR use different schemas, it's not recommended to import Statspack data directly into the AWR repository.
The other options are incorrect because:
* A (Incorrect): expdp is not designed to export from Statspack, and awrload is intended for loading from an AWR export file, not a Statspack export.
* B (Incorrect): Although expdp and impdp are used for exporting and importing data, the AWR repository schema is different from the Statspack schema, so importing Statspack data directly into the AWR repository is not recommended.
* C (Incorrect): Using expdp to export from Statspack and then importing directly into the AWR repository is not the correct approach due to the schema differences between Statspack and AWR.
References:
* Oracle Database Performance Tuning Guide: Migrating from Statspack to AWR


NEW QUESTION # 25
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?

  • A. ALTER SYSTEM SET CURSOR_INVALIDATION = DEFERRED;
  • B. ALTER SYSTEM SET CURSOR_SHARING = FORCE;
  • C. ALTER SYSTEM SET SESSION CACHED CURSORS = 500;
  • D. ALTER SYSTEM SET CURSOR_SPACE_FOR_TIME - TRUE;

Answer: A

Explanation:
The cursor: pin S wait on X wait 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 the cursor: pin S wait on X wait events.
The other options are incorrect in addressing this issue:
* A (Incorrect): Setting CURSOR_SHARING to FORCE makes the optimizer replace literal values with bind variables. It doesn't address the contention for cursor pins directly.
* B (Incorrect): CURSOR_SPACE_FOR_TIME=TRUE aims 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 X waits.
* D (Incorrect): Increasing SESSION_CACHED_CURSORS caches more session cursors but doesn't necessarily prevent the contention indicated by the cursor: pin S wait on X wait events.
References:
* Oracle Database Reference: CURSOR_INVALIDATION
* Oracle Database Performance Tuning Guide: Reducing Cursor Invalidation


NEW QUESTION # 26
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 performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.
  • B. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.
  • C. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.
  • D. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.
  • E. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.

Answer: C,E

Explanation:
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


NEW QUESTION # 27
Examine these statements and output:

What parameter change activates the generation and use of SQL Plan Directives7

  • A. optimizer_capture_sql_plan_baselines_TRUE
  • B. optimizer_adaptive_statistics = TRUE
  • C. optimizer_adaptive_plans=TRUE
  • D. optimizer_features_enable=12.2.0.1
  • E. optimizer_dynamic_sampling=11

Answer: B

Explanation:
The optimizer_adaptive_statistics parameter, when set to TRUE, enables the optimizer to use adaptive statistics, such as SQL Plan Directives, to help improve plans by automatically adjusting them based on the actual execution statistics.
References:
* Oracle Database SQL Tuning Guide, 19c


NEW QUESTION # 28
......

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