1Z1-084 TEST PREP | RELIABLE 1Z1-084 EXAM REGISTRATION

1z1-084 Test Prep | Reliable 1z1-084 Exam Registration

1z1-084 Test Prep | Reliable 1z1-084 Exam Registration

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q19-Q24):

NEW QUESTION # 19
Examine this statement and output:

Which three statements are true?

  • A. Session 8779 may be waiting for a user or application response.
  • B. Session 9857 waited 1354 seconds for another process, which was also waiting for a transaction to end.
  • C. 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.
  • D. Session 9857 is not waiting.
  • E. Session 8779 may be waiting due to a network problem.
  • F. Both 9822 and 8779 sessions are waiting for operating system resources.

Answer: A,C,E

Explanation:
For this SQL statement and output, we can analyze theEVENTcolumn 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 # 20
Examine this statement and output:

Which two situations can trigger this error?

  • A. The capture directory is part of the root file system.
  • B. The user lacks the required privileges to execute the DBMS WORKLOAD CAPTURE package or the directory.
  • C. The syntax is incomplete.
  • D. The instance is unable to access the capture directory.
  • E. There is a file in the capture directory.

Answer: B,D

Explanation:
The ORA-15505 error indicates that the instance encountered errors while trying to access the specified directory. This could be due to:
A: Insufficient privileges: The user attempting to start the workload capture might not have the required permissions to execute the DBMS_WORKLOAD_CAPTURE package or to read/write to the directory specified.
E: Accessibility: The database instance may not be able to access the directory due to issues such as incorrect directory path, directory does not exist, permission issues at the OS level, or the directory being on a file system that's not accessible to the database instance.
References:
* Oracle Database Error Messages, 19c
* Oracle Database Administrator's Guide, 19c


NEW QUESTION # 21
Examine these statements and output:

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

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

Answer: A

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 # 22
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=ALL and
    CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC+TUNING
  • B. STATISTICS_LEVEL=BASIC and CONTROL_MANAGEMENT_PACK ACCESS=DIAGOSTIC
  • C. STATISTICS_LEVEL=TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC
  • D. STATISTICS_LEVEL=TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS-
    DIAGOSTIC*TUNING

Answer: A

Explanation:
Monitoring of Database Operations requires that the STATISTICS_LEVEL parameter be set to ALL and CONTROL_MANAGEMENT_PACK_ACCESS be set to DIAGNOSTIC+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 # 23
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: HW - contention
  • B. enq: TX - allocate ITL entry
  • C. enq: SQ - contention
  • D. enq: TM - contention

Answer: A

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 # 24
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