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Free Oracle 1Z0-084 Exam Braindumps (page: 2)

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PDF with 55 Questions

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?

  1. Trace Analyzer and Tracsess
  2. Trcsess and TKPROF
  3. Autotrace and TKPROF
  4. TKPROF and Trace Analyzer

Answer(s): B

Explanation:

To produce a consolidated formatted trace file from multiple trace files generated by all clients for a single service, the combination of trcsess and TKPROF utilities is used. The trcsess utility consolidates trace files based on specified criteria such as session, client identifier, or service name. This results in a single trace file that combines the desired tracing information. Next, TKPROF is used to format the output of the trace file generated by trcsess, providing a readable summary of the trace, including execution counts, execution times, and SQL statement text along with execution plans.
Steps:
Use trcsess to combine trace files:
Command: trcsess output=consolidated.trc service=your_service_name *.trc Use TKPROF to format the consolidated trace file:
Command: tkprof consolidated.trc output.txt explain=user/password sys=no sort=prsela,fchela


Reference:

Oracle Database Performance Tuning Guide, 19c
Oracle Database Utilities, 19c



Which two statements are true about cursor sharing?

  1. 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.
  2. Adaptive Cursor Sharing guarantees that a suboptimal plan will never be used on any execution of a SQL statement.
  3. Setting optimizer_capture_sql_plan_baselines to TRUE loads all adaptive plans for the same statement into the cursor cache.
  4. Setting cursor_sharing to EXACT prevents Adaptive Cursor Sharing from being used.
  5. 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.

Answer(s): A,D

Explanation:

A) When Cursor_sharing is set to FORCE, Oracle tries to avoid hard parses by replacing literals in SQL statements with bind variables, even if the original statement didn't include bind variables. This can lead to the use of a single execution plan for multiple executions of a statement with different literal values, which might not be optimal for all executions. D) Setting cursor_sharing to EXACT ensures that SQL statements must match exactly for them to share a cursor. This setting prevents the use of Adaptive Cursor Sharing (ACS) since ACS relies on the ability to share cursors among similar statements that differ only in their literal values. With EXACT, there's no cursor sharing for statements with different literals, hence no opportunity for ACS to operate.


Reference:

Oracle Database SQL Tuning Guide, 19c
Oracle Database Reference, 19c



Examine this statement and output:



Which three statements are true?

  1. Both 9822 and 8779 sessions are waiting for operating system resources.
  2. Session 8779 may be waiting due to a network problem.
  3. Session 9857 waited 1354 seconds for another process, which was also waiting for a transaction to end.
  4. Session 9857 is not waiting.
  5. Session 8779 may be waiting for a user or application response.
  6. 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(s): B,E,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.


Reference:

Oracle Database Reference, 19c
Oracle Wait Events Documentation



Which two statements are true about session wait information contained in v$session or v$session_wait?

  1. Rows for sessions displaying WAITED UNKNOWN TIME in the STATE column indicate that the session is still waiting.
  2. Rows for sessions that are currently waiting have a wait time of 0.
  3. Rows for sessions that are not waiting might contain the actual wait time for the last event for which they waited.
  4. Rows for sessions that are currently waiting have their wait time incremented every microsecond.
  5. Rows for sessions that are not waiting always contain the total wait time since the session started.

Answer(s): B,C

Explanation:

In the V$SESSION view, Oracle provides information about the session waits:
B) When the WAIT_TIME column has a value of 0, it signifies that the session is currently waiting for a resource. This column represents the duration of the current or last wait. C) If the session is not actively waiting, the WAIT_TIME column shows the time the session spent waiting for the last wait event. If the STATE column is showing "WAITED KNOWN TIME", it means the session is not currently waiting, but it indicates the time for which it had waited.


Reference:

Oracle Database Reference, 19c
Oracle Database Performance Tuning Guide, 19c






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