SIMPLIFY EXAM PREPARATION WITH OUR SIMPLE ORACLE 1Z0-084 EXAM Q&A

Simplify Exam Preparation With Our Simple Oracle 1Z0-084 Exam Q&A

Simplify Exam Preparation With Our Simple Oracle 1Z0-084 Exam Q&A

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Oracle 1Z0-084 (Oracle Database 19c Performance and Tuning Management) Certification Exam is a highly sought-after certification exam for those who want to specialize in performance tuning and management of Oracle Database 19c. Oracle Database 19c Performance and Tuning Management certification exam is designed to test the candidate's knowledge and skills in managing and tuning the performance of an Oracle Database 19c. 1Z0-084 Exam covers a wide range of topics including performance tuning methodology, database architecture, SQL tuning, memory management, and more.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q54-Q59):

NEW QUESTION # 54
Examine these commands, which execute successfully:

Which statement is true?

  • A. AWR- snapshots in all pluggable databases will be purged automatically after every 60 mins.
  • B. AD DM is enabled for all pluggable databases.
  • C. ADDM, AWR, and ASH reports can be purged automatically.
  • D. AWR snapshots can be purged manually in pluggable databases.

Answer: D

Explanation:
The DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS procedure allows
setting attributes related to AWR snapshots. While the interval setting controls the frequency of snapshot generation, purging them is a separate process that can be managed either automatically (with retention settings) or manually.References:
* Oracle Database PL/SQL Packages and Types Reference, 19c
* Oracle Multitenant Administrator's Guide, 19c


NEW QUESTION # 55
What are the least elevated values of statistics_level and C0NTR0LJ4ANAGEMENT_PACK_ACCESS that allow the usage of Monitoring of Database Operations?

  • A. STATISTICS_LEVEL=TYPICAL and
    CONTROL_MANAGEMENT_PACK_ACCESS-DIAGOSTIC*TUNING
  • B. STATISTICS_LEVEL=TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC
  • C. STATISTICS_LEVEL=ALL and
    CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC+TUNING
  • D. STATISTICS_LEVEL=BASIC and CONTROL_MANAGEMENT_PACK ACCESS=DIAGOSTIC

Answer: C

Explanation:
Monitoring of Database Operations requires that theSTATISTICS_LEVELparameter be set toALLand CONTROL_MANAGEMENT_PACK_ACCESSbe set toDIAGNOSTIC+TUNING. These settings enable all the advisory features and automatic tuning features within the Oracle Database, including the Automatic Workload Repository (AWR), Automatic Database Diagnostic Monitor (ADDM), and the full functionality of the SQL Tuning Advisor and SQL Access Advisor, which are components of the Diagnostic and Tuning packs.
* STATISTICS_LEVEL=ALL:This setting enables the collection of all system statistics for problem detection and self-tuning purposes.
* CONTROL_MANAGEMENT_PACK_ACCESS=DIAGNOSTIC+TUNING:This grants access to both the Diagnostic Pack and the Tuning Pack, which are essential for detailed performance monitoring and tuning capabilities.
References:
* Oracle Database Reference:STATISTICS_LEVEL
* Oracle Database Licensing Information User Manual:Oracle Database Management Packs


NEW QUESTION # 56
Which three statements are true about tuning dimensions and details of v$sys_time_model and DB time?

  • A. Statspack cannot account for high CPU time when CPU TIME is a Top 10 event in DB time. When CPU time is high, SQL tuning may improve performance.
  • B. Systems in which CPU time is dominant need more tuning that those in which WAIT TIME is dominant.
  • C. DB Time accounts for all time used by background processes and user sessions.
  • D. When WAIT TIME is high, instance tuning may improve performance.
  • E. The proportion of WAIT TIME to CPU TIME always increases with increased system load.
  • F. Parse Time Elapsed accounts for successful soft and hard parse operations only.

Answer: A,C,D

Explanation:
A: Statspack is a performance diagnostic tool that can help identify high CPU usage issues. High CPU time may indicate that SQL statements need to be tuned for better performance.
D: High wait times can often be reduced by instance tuning, such as adjusting database parameters or improving I/O performance.
F: DB Time is a cumulative time metric that includes the time spent by both user sessions and background processes executing database calls.References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Concepts, 19c


NEW QUESTION # 57
Examine this statement and output:

Which three statements are true?

  • A. Session 9857 is not waiting.
  • B. Session 8779 may be waiting due to a network problem.
  • C. Session 8779 may be waiting for a user or application response.
  • D. Both 9822 and 8779 sessions are waiting for operating system resources.
  • E. Session 9857 waited 1354 seconds for another process, which was also waiting for a transaction to end.
  • F. Session 9822 will always stop waiting if the session that owns the TX enqueue issues a COMMIT statement as session 9822 is the first session in the transaction queue.

Answer: B,C,F

Explanation:
For this SQL statement and output, we can analyze the EVENT column to understand the type of wait:
B: The event "SQL*Net message from client" typically indicates that the session is waiting for a response from the client. This can be due to a network issue, user response, or an application processing delay.
E: The event "SQL*Net message from client" also implies that the session is idle waiting for the client (a user or an application) to send a request to the server. This event usually indicates that the session is not actively working but is instead waiting for the next command.
F: The wait event "enq: TX - row lock contention" suggests that session 9822 is waiting for a row-level lock held by another session. If the holding session issues a COMMIT or ROLLBACK, the lock will be released, and session 9822 will stop waiting. Since this session is experiencing row lock contention, it implies it's waiting for a specific transaction to complete.
References:
* Oracle Database Reference, 19c
* Oracle Wait Events Documentation


NEW QUESTION # 58
Multiple sessions are inserting data concurrently into a table that has an LOB column.
At some point in time, one of the sessions cannot find available space in the LOB segment and needs to allocate a new extent.
Which wait event will be raised in the other sessions that need space in the LOB column?

  • A. enq: SQ - contention
  • B. enq: HW - contention
  • C. enq: TM - contention
  • D. enq: TX - allocate ITL entry

Answer: B

Explanation:
When sessions concurrently insert data into a table with an LOB column and one session needs to allocate a new extent because it cannot find available space, the wait event associated with this contention is "enq: HW - contention". The HW stands for High Water Mark which is related to space allocation in the database segment. When a session needs to allocate a new extent, it may raise this wait event in other sessions that are also attempting to allocate space in the same LOB segment.
References
* Oracle Database 19c Reference Guide - enq: HW - contention


NEW QUESTION # 59
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