1Z0-084 RELATED CERTIFICATIONS - 1Z0-084 STUDY MATERIALS REVIEW

1Z0-084 Related Certifications - 1Z0-084 Study Materials Review

1Z0-084 Related Certifications - 1Z0-084 Study Materials Review

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Oracle 1Z0-084 Certification Exam is an important certification for IT professionals who want to validate their skills and knowledge in Oracle Database 19c performance and tuning management. 1Z0-084 exam is designed to test the candidate's understanding of the Oracle Database 19c performance tuning concepts, best practices, and tools. It is also designed to validate the candidate's ability to analyze the database performance issues and suggest the best tuning solutions.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q36-Q41):

NEW QUESTION # 36
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. SQL Performance Analyzer
  • B. AWR Compare Periods report
  • C. Database Replay
  • 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 # 37
Which two options are part of a Soft Parse operation?

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

Answer: C


NEW QUESTION # 38
Database performance degraded between 23:15 and 23:30 for the last three nights. The awr snapshot interval is one hour. The AODM report contains nothing about this performance problem.
With which tool can you further analyze this problem?

  • A. SQL Performance Analyzer
  • B. AWR Compare Periods report
  • C. Active Session History report
  • D. SQL Tuning Advisor

Answer: C

Explanation:
The Active Session History (ASH) report is a tool that provides detailed information about active sessions for the time period specified. Since the AWR snapshot interval is one hour and does not capture the granularity needed for this issue, ASH reports aremore suitable as they contain more granular data for sessions that were active during the period of interest.
References:
* Oracle Database Performance Tuning Guide, 19c


NEW QUESTION # 39
Which two options are part of a Soft Parse operation?

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

Answer: C

Explanation:
During a soft parse, Oracle checks the shared SQL area to see if an incoming SQL statement matches one already in the shared pool. This operation includes syntax and semantic checks. The syntax check ensures the statement is properly formed, and the semantic check confirms that all the objects referenced in the SQL statement exist and that the user has the necessary privileges to access them.References:
* Oracle Database Concepts, 19c
* Oracle Database SQL Tuning Guide, 19c


NEW QUESTION # 40
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_SPACE_FOR_TIME - TRUE;
  • B. ALTER SYSTEM SET SESSION CACHED CURSORS = 500;
  • C. ALTER SYSTEM SET CURSOR_SHARING = FORCE;
  • D. ALTER SYSTEM SET CURSOR_INVALIDATION = DEFERRED;

Answer: D

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 # 41
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