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Valid Oracle Database 19c Performance and Tuning Management braindumps pdf & 1Z0-084 valid dumps

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Oracle 1Z0-084 exam is an essential certification for IT professionals who specialize in database performance and tuning management. Oracle Database 19c Performance and Tuning Management certification validates the candidates' expertise in designing, implementing, and managing Oracle Database 19c performance and tuning solutions. 1Z0-084 exam covers a wide range of topics related to performance tuning, including database architecture, memory management, SQL tuning, database monitoring, and optimization techniques.

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Oracle 1Z0-084 Certification Exam validates a candidate's expertise in performance and tuning management for Oracle Database 19c. 1Z0-084 exam is intended for database administrators and professionals who wish to demonstrate their skills in optimizing Oracle Databases to enhance their performance and scalability.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q19-Q24):

NEW QUESTION # 19
Which two actions can cause invalidation or loss of one or more results in the SQL Query Result Cache?

A. Decreasing the value set for RESULT_CACHE_REMOTE_EXPIRATION.
B. result_cache_max_size is set dynamically to 0.
C. One or more results were aged out of the result cache.
D. A request was made by the RCBG background of a non-RAC database.
E. A request was made by the RCBG background process in a physical standby database that is opened read only and whose primary has a result cache.

Answer: B,C

Explanation:
The SQL Query Result Cache stores the results of queries and PL/SQL function calls for reuse. However, entries in the result cache can be invalidated or lost under certain conditions:
A: Results can be aged out of the cache when the cache becomes full and new results need to be stored. This process ensures that the cache does not exceed its allocated memory and that it contains the most recently used entries.
B: Setting theRESULT_CACHE_MAX_SIZEparameter to 0 will effectively disable the result cache and all cached results will be lost, as Oracle will no longer allocate any memory to the result cache.
References:
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 20
Which application lifecycle phase could be managed reactively?

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

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 # 21
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. Increasing the size of MEMORYTARGET
C. setting dbwr_io_slaves to 64
D. reducing the values of DB_FILE_MULTILOCK_READ_COUNT to 64
E. increasing the value of DBWRITERPROCESSES to 64,

Answer: C,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 # 22
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. Increasing the size of MEMORYTARGET
C. setting dbwr_io_slaves to 64
D. reducing the values of DB_FILE_MULTILOCK_READ_COUNT to 64
E. increasing the value of DBWRITERPROCESSES to 64,

Answer: C,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 theDBWR_IO_SLAVESparameter 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 ofDBWRITERPROCESSESenables 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 # 23
Which procedure gathers statistics that are always used in the generation of any execution plan?

A. DBMS_STATS.GATHER_FIXED_ OBJECTS_STATS
B. DBMS_STATS.GATHER_DATABASE_STATS
C. DBMS_STATS.GATHER_DICTIONARY_STATS
D. DBMS_STATS.GATHER_SYSTEM_STATS

Answer: B

Explanation:
TheDBMS_STATS.GATHER_DATABASE_STATSprocedure is used to gather statistics for all schema objects in the database that do not have up-to-date statistics. These statistics are essential for the optimizer to make informed decisions about the most efficient way to execute a query. The procedure collects statistics such as table and column statistics, index statistics, and system statistics, which are all used in the execution plan generation.
References:
* Oracle Database PL/SQL Packages and Types Reference, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 24
......

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