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Oracle 1Z0-084 Certification Exam is designed to test an individual's knowledge and skills in performance and tuning management of Oracle Database 19c. 1Z0-084 exam is intended for database administrators, developers, and consultants who are responsible for monitoring and improving the performance of their organization's Oracle databases.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q30-Q35):

NEW QUESTION # 30
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

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

Answer: A,D

Explanation:
When ASMM is disabled, the sizes of the automatically managed SGA components remain at their current values. ASMM is controlled by theSGA_TARGETparameter. IfSGA_TARGETis 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 settingSGA_TARGETto 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 # 31
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 60% cache hit ratio can be observed for database instances which have very good I/O performance.
C. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.
D. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
E. The performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.

Answer: A,D

NEW QUESTION # 32
Examine this statement and output:

Which two situations can trigger this error?

A. The user lacks the required privileges to execute the DBMS WORKLOAD CAPTURE package or the directory.
B. The capture directory is part of the root file system.
C. There is a file in the capture directory.
D. The instance is unable to access the capture directory.
E. The syntax is incomplete.

Answer: A,D

Explanation:
The ORA-15505 error indicates that the instance encountered errors while trying to access the specified directory. This could be due to:
A: Insufficient privileges: The user attempting to start the workload capture might not have the required permissions to execute the DBMS_WORKLOAD_CAPTURE package or to read/write to the directory specified.
E: Accessibility: The database instance may not be able to access the directory due to issues such as incorrect directory path, directory does not exist, permission issues at the OS level, or the directory being on a file system that's not accessible to the database instance.
References:
* Oracle Database Error Messages, 19c
* Oracle Database Administrator's Guide, 19c

NEW QUESTION # 33
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:

Which two actions can help reduce the number of these waits7

A. increasing the value of DB_FILE_MULTIBLOCK_READ_COUNT to 128
B. reducing the values of DB_FILE_MULTILOCK_READ_COUNT to 64
C. Increasing the size of MEMORYTARGET
D. setting dbwr_io_slaves to 64
E. increasing the value of DBWRITERPROCESSES to 64,

Answer: D,E

Explanation:
Given a server with 64 CPUs, if the buffer cache size increase did not alleviate free buffer waits and buffer busy waits, one can look into optimizing I/O and the efficiency of the DB writer processes.
C: Setting the DBWR_IO_SLAVES parameter to a non-zero value, such as the number of CPUs, would initiate I/O slave processes to assist the DB writer process. This can help reduce I/O contention when writing from the buffer cache to disk, particularly for systems without asynchronous I/O capabilities.
D: Increasing the value of DBWRITERPROCESSES enables multiple DB writer processes to be active simultaneously. In a system with many CPUs, such as 64, increasing this value can improve the write throughput to disk and potentially reduce buffer busy waits.
References:
* Oracle Database Reference, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 34
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 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.
B. 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.
C. Export the data by using expdp from Statspack and import it by using $ORACLE_HOME/rdbms/admin
/awrload into the AWR repository.
D. Export the data by using expdp from the ftatspack repository and import it by using impdp into the AWR repository.

Answer: A

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 the exp utility 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): expdp is not designed to export from Statspack, and awrload is intended for loading from an AWR export file, not a Statspack export.
* B (Incorrect): Although expdp and impdp are 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): Using expdp to 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 # 35
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