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Oracle Database 19c Performance and Tuning Management Sample Questions (Q38-Q43):

NEW QUESTION # 38
A database supporting a mixed workload is hosted on a server with 64 CPUs.
A large number of free buffer waits and buffer busy waits occur affecting performance.
The buffer cache size was then increased but after a few hours, the same wait events occur more often than before the change.
Examine these parameter settings:

Which two actions can help reduce the number of these waits7

A. increasing the value of DB_FILE_MULTIBLOCK_READ_COUNT to 128
B. setting dbwr_io_slaves to 64
C. reducing the values of DB_FILE_MULTILOCK_READ_COUNT to 64
D. increasing the value of DBWRITERPROCESSES to 64,
E. Increasing the size of MEMORYTARGET

Answer: B,D

Explanation:
Given a server with 64 CPUs, if the buffer cache size increase did not alleviate free buffer waits and buffer busy waits, one can look into optimizing I/O and the efficiency of the DB writer processes.
C: Setting the DBWR_IO_SLAVES parameter to a non-zero value, such as the number of CPUs, would initiate I/O slave processes to assist the DB writer process. This can help reduce I/O contention when writing from the buffer cache to disk, particularly for systems without asynchronous I/O capabilities.
D: Increasing the value of DBWRITERPROCESSES enables multiple DB writer processes to be active simultaneously. In a system with many CPUs, such as 64, increasing this value can improve the write throughput to disk and potentially reduce buffer busy waits.
References:
* Oracle Database Reference, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 39
Examine this statement and output:

Which three statements are true?

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

Answer: A,B,F

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 # 40
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: TX - allocate ITL entry
C. enq: TM - contention
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 # 41
Which procedure gathers statistics that are always used in the generation of any execution plan?

A. DBMS_STATS.GATHER_DATABASE_STATS
B. DBMS_STATS.GATHER_DICTIONARY_STATS
C. DBMS_STATS.GATHER_FIXED_ OBJECTS_STATS
D. DBMS_STATS.GATHER_SYSTEM_STATS

Answer: A

Explanation:
TheDBMS_STATS.GATHER_DATABASE_STATSprocedure is used to gather statistics for all schema objects in the database that do not have up-to-date statistics. These statistics are essential for the optimizer to make informed decisions about the most efficient way to execute a query. The procedure collects statistics such as table and column statistics, index statistics, and system statistics, which are all used in the execution plan generation.
References:
* Oracle Database PL/SQL Packages and Types Reference, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 42
Examine these statements and output:

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

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

Answer: C

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 # 43
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100% Pass Perfect Oracle - Test 1z1-084 Online

Accurate Oracle - Test 1z1-084 Online

Oracle Database 19c Performance and Tuning Management Sample Questions (Q38-Q43):

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