AVAIL EFFICIENT FREQUENT 1Z0-084 UPDATES TO PASS 1Z0-084 ON THE FIRST ATTEMPT

Avail Efficient Frequent 1Z0-084 Updates to Pass 1Z0-084 on the First Attempt

Avail Efficient Frequent 1Z0-084 Updates to Pass 1Z0-084 on the First Attempt

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Oracle 1Z0-084 certification exam focuses on performance and tuning management for Oracle Database 19c. 1Z0-084 exam is designed for professionals who want to enhance their skills in improving database performance and reducing system downtime. The 1Z0-084 Exam is intended for database administrators, system engineers, and technical consultants who have a good understanding of Oracle Database 19c concepts and technologies.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q43-Q48):

NEW QUESTION # 43
An Oracle 19c database uses default values for all optimizer initialization parameters.
After a table undergoes partition maintenance, a large number of wait events occur for:
cursor: pin S wait on X
Which command reduces the number of these wait events?

  • A. ALTER SYSTEM SET SESSION CACHED CURSORS = 500;
  • B. ALTER SYSTEM SET CURSOR_SHARING = FORCE;
  • C. ALTER SYSTEM SET CURSOR_INVALIDATION = DEFERRED;
  • D. ALTER SYSTEM SET CURSOR_SPACE_FOR_TIME - TRUE;

Answer: C

Explanation:
Thecursor: pin S wait on Xwait event suggests contention for a cursor pin, which is associated with mutexes (a type of locking mechanism) that protect the library cache to prevent concurrent modifications. This issue can often be alleviated by deferring the invalidation of cursors until the end of the call to reduce contention.
The correct command to use would be:
* C (Correct):ALTER SYSTEM SET CURSOR_INVALIDATION=DEFERRED;This setting defers the invalidation of dependent cursors until the end of the PL/SQL call, which can reduce thecursor: pin S wait on Xwait events.
The other options are incorrect in addressing this issue:
* A (Incorrect):SettingCURSOR_SHARINGtoFORCEmakes the optimizer replace literal values with bind variables. It doesn't address the contention for cursor pins directly.
* B (Incorrect):CURSOR_SPACE_FOR_TIME=TRUEaims to reduce the parsing effort by keeping cursors for prepared statements open. It may increase memory usage but does not directly resolve cursor: pin S wait on Xwaits.
* D (Incorrect):IncreasingSESSION_CACHED_CURSORScaches more session cursors but doesn't necessarily prevent the contention indicated by thecursor: pin S wait on Xwait events.
References:
* Oracle Database Reference:CURSOR_INVALIDATION
* Oracle Database Performance Tuning Guide:Reducing Cursor Invalidation


NEW QUESTION # 44
You need to collect and aggregate statistics for the ACCTG service and PAYROLL module, and execute:

Where do you find the output of this command?

  • A. By viewing V$SERV_MOD_ACT_STATS
  • B. In the current working directory
  • C. In $ORACLE_BASE/diag/rdbms/<db unique name>/<instance name>/trace
  • D. By viewing V$SERVICE_STATS

Answer: A

Explanation:
When you enable statistics gathering for a specific service and module using DBMS_MONITOR.
SERV_MOD_ACT_STAT_ENABLE, the output is aggregated and can be viewed using the V$SERV_MOD_ACT_STATS dynamic performance view. This view contains the cumulative statistics of database activity broken down by service and module, which is exactly what you collect when executing the provided command.
* B (Incorrect): While many types of trace files are located in the Diagnostic Destination directory (
$ORACLE_BASE/diag), the aggregated statistics for services and modules are not written to trace files but are instead viewable through dynamic performance views.
* C (Incorrect): The V$SERVICE_STATS view provides service-level statistics but does not provide the combined service/module-level breakdown.
* D (Incorrect): The output of the PL/SQL block is not written to a file in the current working directory; it is stored in the data dictionary and accessible via dynamic performance views.
References:
* Oracle Database PL/SQL Packages and Types Reference: DBMS_MONITOR
* Oracle Database Reference: V$SERV_MOD_ACT_STATS


NEW QUESTION # 45
Examine this statement and output:

Which three statements are true?

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

Answer: C,E,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 # 46
Which two statements are true about the use and monitoring of Buffer Cache Hit ratios and their value in tuning Database I/O performance?

  • A. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.
  • B. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
  • C. The performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.
  • D. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.
  • E. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.

Answer: A,B


NEW QUESTION # 47
You are informed that the RMAN session that is performing the database duplication is much slower than usual. You want to know the approximate time when the rman operation will be completed.
Which view has this information?

  • A. V$SESSION_LONGOPS
  • B. V$RMAN_BACKUP_JOB_DETAILS
  • C. V$SESSTAT
  • D. V$SESSION

Answer: A

Explanation:
In Oracle Database, theV$SESSION_LONGOPSview provides insights into various operations within the database that are expected to take more than six seconds to complete. These include operations related to RMAN (Recovery Manager), such as database duplication tasks. This view displays information about the progress of these long-running operations, including the start time, elapsed time, and estimated time to completion.
When an RMAN session is performing a database duplication and is observed to be slower than usual, checking theV$SESSION_LONGOPSview can give an approximation ofwhen the RMAN operation might complete. This view includes fields likeTIME_REMAININGandELAPSED_SECONDSthat help in estimating the completion time of the operation based on its current progress.
References:
* Oracle Database Reference:V$SESSION_LONGOPS
* Oracle Database Backup and Recovery User's Guide:Monitoring RMAN Jobs


NEW QUESTION # 48
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