ORACLE 1Z0-084 ACTUAL TESTS & NEW 1Z0-084 EXAM LABS

Oracle 1Z0-084 Actual Tests & New 1Z0-084 Exam Labs

Oracle 1Z0-084 Actual Tests & New 1Z0-084 Exam Labs

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Oracle 1Z0-084 Certification Exam is designed for individuals who want to demonstrate their expertise in managing the performance and tuning of Oracle Database 19c. 1Z0-084 exam is aimed at database administrators, performance analysts, and developers who want to prove their skills in managing and tuning Oracle Database 19c to ensure optimal performance.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q31-Q36):

NEW QUESTION # 31
Which application lifecycle phase could be managed reactively?

  • A. Testing
  • B. Deployment
  • C. Upgrade or migration
  • D. Production
  • E. Design and development

Answer: D

Explanation:
The production phase of the application lifecycle is often managed reactively. While proactive measures and performance tuning are essential, unforeseen issues can arise in production that require immediate attention and resolution. Reactive management involves monitoring performance and responding to issues as they occur, ensuring the application maintains acceptable performance levels for end-users.
References
* Oracle Database 19c Performance Tuning Guide - Reactive Tuning


NEW QUESTION # 32
Which three types of statistics are captured by statspack with snap level 6?

  • A. Enqueue statistics
  • B. Optimizer execution plans
  • C. Segment-level statistics
  • D. Plan usage data
  • E. Parent and child latches
  • F. Parent and child latches

Answer: A,C,E

Explanation:
Statspack is a performance diagnostic tool provided by Oracle prior to the introduction of the Automatic Workload Repository (AWR). At snap level 6, Statspack captures the following types of statistics:
* A (Correct):Parent and child latches are captured. Latch statistics provide information about contention for latches, which are low-level serialization mechanisms used by Oracle.
* E (Correct):Enqueue statistics, which provide information on the waits for locks that manage the concurrency between users.
* F (Correct):Segment-level statistics, which provide detailed information on database segments such as tables, indexes, etc., to identify I/O and contention issues.
* C (Incorrect):While optimizer execution plans are an essential aspect of performance tuning, detailed execution plan capture is not part of the Statspack report at level 6.
* D (Incorrect):Plan usage data refers to how frequently a plan is being used, which is more associated with AWR and not typically captured in Statspack reports.
References:
* Oracle Database Performance Tuning Guide:Using Statspack


NEW QUESTION # 33
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

  • A. All auto-tuned SGA components are reset to their original user-defined values.
  • B. All SGA components excluding fixed SGA and other internal allocations are readjusted immediately after disabling ASMM.
  • C. The SGA size remains unaffected after disabling ASMM.
  • D. All SGA components retain their current sizes at the time of disabling.
  • E. Both SGA_TARGET and SGA_MAX_SIZE must be set to zero.
  • F. It requires a database instance restart to take effect.

Answer: C,D

Explanation:
When ASMM is disabled, the sizes of the automatically managed SGA components remain at their current values. ASMM is controlled by the SGA_TARGET parameter. If SGA_TARGET is set to a non-zero value, ASMM is enabled and Oracle will automatically manage the sizes of the various SGA components. When ASMM is disabled, by setting SGA_TARGET to zero, the SGA components that were automatically sized will retain their current sizes rather than being reset to their original user-defined values. The overall size of the SGA remains the same unless manually changed by modifying individual component sizes or SGA_MAX_SIZE.
References:
* Oracle Database Administration Guide, 19c
* Oracle Database Performance Tuning Guide, 19c


NEW QUESTION # 34
Which two statements are true about space usage in temporary tablespaces?

  • A. When a session consumes all temporary tablespace storage, then the session would hang until the temporary space used by that session is cleared.
  • B. Temporary tablespaces setting Includes quotas to limit temporary space used by a session for that Temporary tablespace.
  • C. When a global temporary table instantiation is too large to fit in memory, space is allocated in a temporary tablespace.
  • D. A sort will fail if a sort to disk requires more disk space and no additional extent can be found/allocated in/for the sort segment.
  • E. Lack of temporary tablespace space for sort operations can be prevented by using temporary tablespace groups.

Answer: C,E

Explanation:
Regarding space usage in temporary tablespaces, the following statements are true:
* A (Correct):When a global temporary table or a sort operation exceeds the available memory, Oracle Database allocates space in a temporary tablespace to store the temporary data or intermediate results.
* E (Correct):Using temporary tablespace groups can prevent insufficient temporary tablespace for sort operations by providing a collective pool of space from multiple temporary tablespaces, which can be used for user sorting operations.
The other options provided have inaccuracies:
* B (Incorrect):Oracle does not provide a mechanism for setting quotas on temporary tablespaces. Quotas can be set for permanent tablespaces but not for temporary ones.
* C (Incorrect):A sort operation may fail due to insufficient space, but Oracle will attempt to allocate space in the temporary tablespace dynamically. If no space can be allocated, an error is returned rather than a sort failure.
* D (Incorrect):If a session consumes all available temporary tablespace storage, Oracle will not hang the session; it will return an error to the session indicating that it has run out of temporary space.
References:
* Oracle Database Administrator's Guide:Managing Space for Schema Objects
* Oracle Database Concepts:Temporary Tablespaces


NEW QUESTION # 35
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 to 192G and MEMORY_TARGET to 256G.
  • B. Disable Automatic Memory Management and set SGA_TARGET to 256G.
  • C. Set DB_FLASH_CACHE_SIZE to 256G and change device /dev/sdk to 128G.
  • D. Set DB_FLASH_CACHE_SIZE parameter to 192G.
  • E. Set DB_FLASH_CACHE_SIZE parameter to 128G, 64G.

Answer: E

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 you intend 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 # 36
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