2025 100% FREE 1Z0-084–NEWEST 100% FREE EXAM INTRODUCTION | ORACLE DATABASE 19C PERFORMANCE AND TUNING MANAGEMENT LATEST BRAINDUMPS

2025 100% Free 1Z0-084–Newest 100% Free Exam Introduction | Oracle Database 19c Performance and Tuning Management Latest Braindumps

2025 100% Free 1Z0-084–Newest 100% Free Exam Introduction | Oracle Database 19c Performance and Tuning Management Latest Braindumps

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Oracle 1Z0-084 Exam is a comprehensive test comprising 80 multiple-choice questions that need to be completed within 120 minutes. 1Z0-084 exam is designed to challenge candidates’ expertise in Oracle Database performance tuning, and it includes questions on a wide range of topics, such as query optimization, automatic database tuning, parallel operations, optimizer statistics management, and Oracle Database Resource Manager.

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Oracle 1Z0-084 Certification Exam is an excellent way for database professionals to demonstrate their expertise in performance and tuning management. By passing 1Z0-084 exam, candidates can prove to potential employers that they possess the knowledge and skills needed to manage and optimize Oracle Database 19c performance. Additionally, earning this certification can lead to career advancement opportunities and higher salaries.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q54-Q59):

NEW QUESTION # 54
You need to transport performance data from a Standard Edition to an Enterprise Edition database. What is the recommended method to do this?

  • A. Export the data by using expdp from Statspack and import it by using
    $ORACLE_HOME/rdbms/admin/awrload into the AWRrepository.
  • B. Export the data by using expdp from the ftatspack repository and import it by using impdp into the AWR repository.
  • C. Export the data by using the exp utility and parameter file spuexp.par from the Statspack repository and import it by using imp into a dedicated Statspack schema on the destination.
  • D. Export the data by using the expdp utility and parameter file spuexp.par from the Statspack repository and import it by using impdp into Export the data by using expdp from the Statspack repository and import it by using impdp into the AWR repository.

Answer: C

Explanation:
To transport performance data from an Oracle Database Standard Edition, which uses Statspack, to an Enterprise Edition database, which uses AWR, you must consider the compatibility of data structures and repository schemas between these tools. The recommended method is:
* D (Correct):Export the data using theexputility with a parameter file appropriate for Statspack (like spuexp.par) from the Statspack repository and import it into a dedicated Statspack schema on the destination. Since Statspack and AWR use different schemas, it's not recommended to import Statspack data directly into the AWR repository.
The other options are incorrect because:
* A (Incorrect):expdpis not designed to export from Statspack, andawrloadis intended for loading from an AWR export file, not a Statspack export.
* B (Incorrect):Althoughexpdpandimpdpare used for exporting and importing data, the AWR repository schema is different from the Statspack schema, so importing Statspack data directly into the AWR repository is not recommended.
* C (Incorrect):Usingexpdpto export from Statspack and then importing directly into the AWR repository is not the correct approach due to the schema differences between Statspack and AWR.
References:
* Oracle Database Performance Tuning Guide:Migrating from Statspack to AWR


NEW QUESTION # 55
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 PlanBaselinebut forget to disable the SQLProfile and a few days later you find out that the SQL Profile is generating a new execution plan.
Which two statements are true?

  • A. The SQL Plan Baseline must be accepted in order to be used for the execution plan.
  • B. The execution plan is the one enforced by the SQL Profile.
  • C. The SQL Profiles as well as SQL Plan Baseline are implemented using hints, so they both generate the same plan.
  • D. The existence of two concurrent plan stability methods generates a child cursor for every execution.
  • E. The conflict between the two plan stability methods results in an error.
  • F. The execution plan is the one enforced by the SQL Plan Baseline.

Answer: A,B

Explanation:
When both a SQL Profile and a SQL Plan Baseline are in place, the SQL Profile has a stronger preference and the optimizer is more likely to choose the execution plan from the SQL Profile.
C: A SQL Profile is generally more influential than a SQL Plan Baseline because it contains additional statistics and directives that help the optimizer to generate a more efficient execution plan. If both exist, the optimizer will use the profile's plan unless the baseline's plan is proven to be better through the SQL performance monitoring process.
E: SQL Plan Baselines must be accepted before they can be used by the optimizer. If a SQL Plan Baseline is not accepted, it will not be considered for generating the execution plan. Therefore, the presence of an unaccepted SQL Plan Baseline will not automatically force the optimizer to use its plan.
References:
* Oracle Database SQL Tuning Guide, 19c
* Oracle Database Administrator's Guide, 19c


NEW QUESTION # 56
Examine this statement and output:

Which three statements are true?

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

Answer: A,B,E

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.
References:
* Oracle Database Reference, 19c
* Oracle Wait Events Documentation


NEW QUESTION # 57
You must configure and enable Database Smart Flash Cache for a database.
You configure these flash devices:

Examine these parameter settings:

What must be configured so that the database uses these devices for the Database Smart Flash Cache?

  • A. Set DB_FLASH_CACHE_SIZE parameter to 192G.
  • B. Set DB_FLASH_CACHE_SIZE to 192G and MEMORY_TARGET to 256G.
  • C. Disable Automatic Memory Management and set SGA_TARGET to 256G.
  • D. Set DB_FLASH_CACHE_SIZE parameter to 128G, 64G.
  • E. Set DB_FLASH_CACHE_SIZE to 256G and change device /dev/sdk to 128G.

Answer: D

Explanation:
To configure and enable Database Smart Flash Cache, you must set the DB_FLASH_CACHE_SIZE parameter to reflect the combined size of the flash devices youintend to use for the cache. In this scenario, two flash devices are configured: /dev/sdj with 128G and /dev/sdk with 64G.
* Determine the combined size of the flash devices intended for the Database Smart Flash Cache. In this case, it's 128G + 64G = 192G.
* However, Oracle documentation suggests setting DB_FLASH_CACHE_SIZE to the exact sizes of the individual devices, separated by a comma when multiple devices are used.
* Modify the parameter in the database initialization file (init.ora or spfile.ora) or using an ALTER SYSTEM command. Here's the command for altering the system setting:
ALTER SYSTEM SET DB_FLASH_CACHE_SIZE='128G,64G' SCOPE=SPFILE;
* Since this is a static parameter, a database restart is required for the changes to take effect.
* Upon database startup, it will allocate the Database Smart Flash Cache using the provided sizes for the specified devices.
It is important to note that MEMORY_TARGET and MEMORY_MAX_TARGET parameters should be configured independently of DB_FLASH_CACHE_SIZE. They control the Oracle memory management for the SGA and PGA, and do not directly correlate with the flash cache configuration.
References
* Oracle Database 19c Documentation on Database Smart Flash Cache
* Oracle Support Articles and Community Discussions on DB_FLASH_CACHE_SIZE Configuration


NEW QUESTION # 58
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 CURSOR_INVALIDATION = DEFERRED;
  • B. ALTER SYSTEM SET SESSION CACHED CURSORS = 500;
  • C. ALTER SYSTEM SET CURSOR_SPACE_FOR_TIME - TRUE;
  • D. ALTER SYSTEM SET CURSOR_SHARING = FORCE;

Answer: A

Explanation:
The cursor: pin S wait on X wait 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 the cursor: pin S wait on X wait events.
The other options are incorrect in addressing this issue:
* A (Incorrect): Setting CURSOR_SHARING to FORCE makes the optimizer replace literal values with bind variables. It doesn't address the contention for cursor pins directly.
* B (Incorrect): CURSOR_SPACE_FOR_TIME=TRUE aims 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 X waits.
* D (Incorrect): Increasing SESSION_CACHED_CURSORS caches more session cursors but doesn't necessarily prevent the contention indicated by the cursor: pin S wait on X wait events.
References:
* Oracle Database Reference: CURSOR_INVALIDATION
* Oracle Database Performance Tuning Guide: Reducing Cursor Invalidation


NEW QUESTION # 59
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