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Guide for 1Z0-084: Oracle Database 19c: Performance Management and Tuning

Quiz 1Z0-084: Oracle Database 19c: Performance Management and Tuning

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/ 10

Quiz

1/10
You must produce a consolidated formatted trace file by combining all trace files generated by all
clients for a single service.
Which combination of utilities does this?
Select the answer
1 correct answer
A.
Trace Analyzer and Tracsess
B.
Trcsess and TKPROF
C.
Autotrace and TKPROF
D.
TKPROF and Trace Analyzer

Quiz

2/10
Which two statements are true about cursor sharing?
Select the answer
2 correct answers
A.
Setting Cursor_sharing to FORCE can result in a plan that is suboptimal for the majority of values bound to a bind variable when executing a cursor with one or more bind variables.
B.
Adaptive Cursor Sharing guarantees that a suboptimal plan will never be used on any execution of a SQL statement.
C.
Setting optimizer_capture_sql_plan_baselines to TRUE loads all adaptive plans for the same statement into the cursor cache.
D.
Setting cursor_sharing to EXACT prevents Adaptive Cursor Sharing from being used.
E.
Adaptive Cursor Sharing requires histograms on filtered columns, used in equality predicates, to allow different execution plans to be generated for statements whose bound values would normally generate different plans at hard parse time.

Quiz

3/10
Examine this statement and output:

Certification Exam 1Z0-084: Oracle Database 19c: Performance Management and Tuning Oracle Oracle-1Z0-084 1-528826102

Which three statements are true?
Select the answer
3 correct answers
A.
Both 9822 and 8779 sessions are waiting for operating system resources.
B.
Session 8779 may be waiting due to a network problem.
C.
Session 9857 waited 1354 seconds for another process, which was also waiting for a transaction to end.
D.
Session 9857 is not waiting.
E.
Session 8779 may be waiting for a user or application response.
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.

Quiz

4/10
Which two statements are true about session wait information contained in v$session or
v$session_wait?
Select the answer
2 correct answers
A.
Rows for sessions displaying WAITED UNKNOWN TIME in the STATE column indicate that the session is still waiting.
B.
Rows for sessions that are currently waiting have a wait time of 0.
C.
Rows for sessions that are not waiting might contain the actual wait time for the last event for which they waited.
D.
Rows for sessions that are currently waiting have their wait time incremented every microsecond.
E.
Rows for sessions that are not waiting always contain the total wait time since the session started.

Quiz

5/10
For which two actions can SQL Performance Analyzer be used to assess the impact of changes to SQL
performance?
Select the answer
2 correct answers
A.
storage, network, and interconnect changes
B.
operating system upgrades
C.
changes to database initialization parameters
D.
database consolidation for pluggable databases (PDBs)
E.
operating system and hardware migrations

Quiz

6/10
Examine this output of a query of VSPGA_TAPGET_ADVICE:

Certification Exam 1Z0-084: Oracle Database 19c: Performance Management and Tuning Oracle Oracle-1Z0-084 2-2136884648

Which statements is true'
Select the answer
1 correct answer
A.
With a target of 700 MB or more, all multipass executions work areas would be eliminated.
B.
PGAA_AGGREGATE should be set to at least 800 MB.
C.
GGREGATE_TARGET should be set to at least 700 MB.
D.
With a target of 800 MB or more, all one-pass execution work areas would be eliminated.

Quiz

7/10
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:

Certification Exam 1Z0-084: Oracle Database 19c: Performance Management and Tuning Oracle Oracle-1Z0-084 3-367462166

Which two actions can help reduce the number of these waits7
Select the answer
2 correct answers
A.
increasing the value of DB_FILE_MULTIBLOCK_READ_COUNT to 128
B.
Increasing the size of MEMORYTARGET
C.
setting dbwr_io_slaves to 64
D.
increasing the value of DBWRITERPROCESSES to 64,
E.
reducing the values of DB_FILE_MULTILOCK_READ_COUNT to 64

Quiz

8/10
You use SQL Tuning Advisor to tune a given SQL statement.
The analysis eventually results in the implementation of a SQL Profile.
You then generate the new SQL Profile plan and enforce it using a SQL Plan Baseline but forget to
disable the SQL Profile and a few days later you find out that the SQL Profile is generating a new
execution plan.
Which two statements are true?
Select the answer
2 correct answers
A.
The existence of two concurrent plan stability methods generates a child cursor for every execution.
B.
The SQL Profiles as well as SQL Plan Baseline are implemented using hints, so they both generate the same plan.
C.
The execution plan is the one enforced by the SQL Profile.
D.
The execution plan is the one enforced by the SQL Plan Baseline.
E.
The SQL Plan Baseline must be accepted in order to be used for the execution plan.
F.
The conflict between the two plan stability methods results in an error.

Quiz

9/10
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?
Select the answer
1 correct answer
A.
SQL Performance Analyzer
B.
AWR Compare Periods report
C.
SQL Tuning Advisor
D.
Active Session History report

Quiz

10/10
Examine this statement and output:

Certification Exam 1Z0-084: Oracle Database 19c: Performance Management and Tuning Oracle Oracle-1Z0-084 4-2682397019

Which two situations can trigger this error?
Select the answer
2 correct answers
A.
The user lacks the required privileges to execute the DBMS WORKLOAD CAPTURE package or the directory.
B.
There is a file in the capture directory.
C.
The syntax is incomplete.
D.
The capture directory is part of the root file system.
E.
The instance is unable to access the capture directory.
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  • Quiz name:1Z0-084: Oracle Database 19c: Performance Management and Tuning
  • Total number of questions:55
  • Number of questions for the test:50
  • Pass score:80%

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