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Oracle 1Z0-084 is an exam designed for professionals who want to enhance their knowledge and expertise in performance and tuning management of Oracle Database 19c. Oracle Database 19c Performance and Tuning Management certification exam is designed to validate the knowledge and skills of database administrators, performance analysts, and developers who are responsible for managing and tuning Oracle databases. 1z1-084 exam tests the candidate's ability to use various performance tuning tools and techniques to optimize database performance and ensure smooth operation.

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

NEW QUESTION # 23
Which three statements are true about tuning dimensions and details of v$sys_time_model and DB time?

A. When WAIT TIME is high, instance tuning may improve performance.
B. Systems in which CPU time is dominant need more tuning that those in which WAIT TIME is dominant.
C. 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.
D. The proportion of WAIT TIME to CPU TIME always increases with increased system load.
E. DB Time accounts for all time used by background processes and user sessions.
F. Parse Time Elapsed accounts for successful soft and hard parse operations only.

Answer: A,C,E

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 # 24
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: TM - contention
C. enq: TX - allocate ITL entry
D. enq: HW - contention

Answer: D

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 asession 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 # 25
Which statement is true about DB time in V$$YS_TIME_MODEL?

A. DB time includes the time spent executing the RMAN backup and restore command.
B. DB time is organized as a simple list of statistics and any time period is attributable to only one statistic.
C. DB tine excludes the time spent waiting for a CPU in the operating system run queue.
D. DB time can be many times greater than the elapsed time since the database instance started.

Answer: D

Explanation:
DB time includes the time spent on user and background processes. It can be greater than the elapsed time because it accumulates the active time of all the processes. For example, if two sessions are each active for 2 seconds at the same time, DB time would accumulate 4 seconds, while the elapsed time would be only 2 seconds.References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Reference, 19c

NEW QUESTION # 26
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 is not waiting.
C. Both 9822 and 8779 sessions are waiting for operating system resources.
D. 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.
E. Session 8779 may be waiting due to a network problem.
F. Session 9857 waited 1354 seconds for another process, which was also waiting for a transaction to end.

Answer: A,D,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 # 27
Which two types of performance problems are reported by ADDM for PDBS?

A. Excessive checkpoint writes
B. User I/O waits
C. SGA sizing issues
D. Top SQL statements
E. I/O capacity limits

Answer: B,E

Explanation:
The Automatic Database Diagnostic Monitor (ADDM) analyzes and reports on various types of performance problems. For Pluggable Databases (PDBs), it can identify issues such as I/O capacity limits which may hinder the overall performance by causing bottlenecks. Additionally, ADDM can report on user I/O waits, which can indicate performance issues related to the time it takes for user queries to read data from the disk.
References:
* Oracle Multitenant Administrator's Guide, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 28
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