1Z0-084 Test Study Guide | 1Z0-084 Latest Exam Practice

DOWNLOAD the newest Actual4dump 1Z0-084 PDF dumps from Cloud Storage for free: https://drive.google.com/open?id=1eV7megVntT-gGX8A16ahX9A246IaRMtC

These 1Z0-084 exam questions braindumps are designed in a way that makes it very simple for the candidates. Each and every 1Z0-084 topic is elaborated with examples clearly. Use Actual4dump top rate Oracle 1Z0-084 Exam Testing Tool for making your success possible. 1Z0-084 exam preparation is a hard subject. Plenty of concepts get mixed up together due to which student feel difficult to identify them. There is no similar misconception in 1Z0-084 Dumps because we have made it more interactive for you. The candidates who are less skilled may feel difficult to understand the 1Z0-084 questions can take help from these braindumps. The tough topics of 1Z0-084 certification have been further made easy with examples, simulations and graphs. Candidates can avail the opportunity of demo of free 1Z0-084 dumps.

To prepare for the Oracle 1Z0-084 exam, you should have a solid foundation in Oracle Database architecture, concepts, and administration. You should also have experience working with Oracle Database 19c, and have a deep understanding of performance and tuning management. A good way to prepare for 1Z0-084 exam is by reviewing the Oracle 1Z0-084 study guide, attending Oracle training courses, reading Oracle documentation, and working on real-world scenarios.

Oracle 1Z0-084 Certification Exam is an advanced-level exam that requires candidates to have a deep understanding of Oracle Database 19c performance management. Candidates should have experience in various performance tuning techniques and be familiar with the tools and utilities used to monitor and manage performance. They should also be able to troubleshoot performance issues and optimize the database for maximum efficiency.

>> 1Z0-084 Test Study Guide <<

Benefits of Taking Oracle 1Z0-084 Practice Exams

Getting tired of humdrum life, you may want to get some successful feeling or try something different instead. We all know that is of important to pass the 1Z0-084 exam and get the 1Z0-084 certification for someone who wants to find a good job in internet area, and it is not a simple thing to prepare for exam. So you are in the right place now. The 1Z0-084 practice materials are a great beginning to prepare your exam. Actually, just think of our 1Z0-084 practice materials as the best way to pass the exam is myopic. They can not only achieve this, but ingeniously help you remember more content at the same time.

Oracle Database 19c Performance and Tuning Management Exam or the 1Z0-084, is an exam that is specially designed for Oracle Database administrators who are looking to get certified in performance management and tuning. To become an Oracle Database certified professional, you need to pass this certification exam. Passing the exam signifies that you have the necessary knowledge and skills to manage and tune the Oracle 19c database performance.

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

NEW QUESTION # 30
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. Disable Automatic Memory Management and set SGA_TARGET to 256G.
B. Set DB_FLASH_CACHE_SIZE parameter to 128G, 64G.
C. Set DB_FLASH_CACHE_SIZE parameter to 192G.
D. Set DB_FLASH_CACHE_SIZE to 256G and change device /dev/sdk to 128G.
E. Set DB_FLASH_CACHE_SIZE to 192G and MEMORY_TARGET to 256G.

Answer: B

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 # 31
Examine this output of a query of VSPGA_TAPGET_ADVICE:

Which statements is true'

A. With a target of 800 MB or more, all one-pass execution work areas would be eliminated.
B. With a target of 700 MB or more, all multipass executions work areas would be eliminated.
C. GGREGATE_TARGET should be set to at least 700 MB.
D. PGAA_AGGREGATE should be set to at least 800 MB.

Answer: A

Explanation:
The query output from V$PGA_TARGET_ADVICE provides tuning information for the PGA (Program Global Area). Let's break it down step by step:
Key Columns in the Output:
* TARGET_MB:
* Represents the hypothetical PGA_AGGREGATE_TARGET values (in megabytes) evaluated by Oracle.
* CACHE_HIT_PERC:
* The percentage of work areas that could execute in-memory (optimal execution) without requiring temporary disk writes.
* Higher percentages indicate fewer work areas requiring disk I/O.
* ESTD_OVERALLOC_COUNT:
* The estimated number of work areas that need to go to disk (multipass operations or overallocations).
Observations from the Data:
* At TARGET_MB = 700 MB:
* The CACHE_HIT_PERC is 68%.
* The ESTD_OVERALLOC_COUNT is 30. This indicates that some multipass work areas still exist.
* At TARGET_MB = 800 MB:
* The CACHE_HIT_PERC rises to 74%.
* The ESTD_OVERALLOC_COUNT drops to 0. This indicates that no work areas require multipass execution.
* At TARGET_MB = 900 MB and above:
* The CACHE_HIT_PERC increases slightly to 82%-84%.
* The ESTD_OVERALLOC_COUNT remains 0, meaning that all work areas are now either optimal or one-pass.
Why D is Correct:
* At 800 MB or more, the ESTD_OVERALLOC_COUNT is 0, indicating that all one-pass execution work areas are eliminated.
* A one-pass execution requires temporary disk I/O for intermediate results, but with sufficient PGA, these are no longer necessary.
Why Other Options Are Incorrect:
* Option A:
* It mentions all multipass executions work areas would be eliminated at 700 MB. This is incorrect because, at 700 MB, the ESTD_OVERALLOC_COUNT is still 30, indicating some multipass work areas still exist.
* Option B:
* Suggests setting the PGA_AGGREGATE_TARGET to at least 800 MB, which is partially correct but does not address the elimination of one-pass execution.
* Option C:
* Suggests setting the PGA_AGGREGATE_TARGET to at least 700 MB, which is not sufficient to eliminate all one-pass executions, as shown by the ESTD_OVERALLOC_COUNT of 30.

NEW QUESTION # 32
Multiple sessions are inserting data concurrently into a table that has an LOB column.
At some point in time, one of the sessions cannot find available space in the LOB segment and needs to allocate a new extent.
Which wait event will be raised in the other sessions that need space in the LOB column?

A. enq: TX - allocate ITL entry
B. enq: TM - contention
C. enq: SQ - contention
D. enq: HW - contention

Answer: D

Explanation:
When sessions concurrently insert data into a table with an LOB column and one session needs to allocate a new extent because it cannot find available space, the wait event associated with this contention is "enq: HW - contention". The HW stands for High Water Mark which is related to space allocation in the database segment.
When asession needs to allocate a new extent, it may raise this wait event in other sessions that are also attempting to allocate space in the same LOB segment.
References
* Oracle Database 19c Reference Guide - enq: HW - contention

NEW QUESTION # 33
Which three statements are true about using the in Memory (IM) column store?

A. It does not improve performance for queries that use join groups on columns from different tables.
B. It can improve OLTP workload performance by avoiding the use of indexes.
C. It does not improve performance for queries using user-defined virtual column results.
D. It improves performance for queries joining several tables using bloom filter joins.
E. It does not improve performance for queries using cached results of function evaluations on columns from the same table.
F. It does not require all database data to fit in memory to improve query performance.

Answer: B,D,F

Explanation:
The Oracle In-Memory (IM) column store feature enhances the performance of databases by providing a fast columnar storage format for analytical workloads while also potentially benefiting OLTP workloads.
* C (True):It can improve OLTP workload performance by providing a faster access path for full table scans and reducing the need for indexes in certain scenarios, as the In-Memory store allows for efficient in-memory scans.
* E (True):The In-Memory column store does not require all database data to fit in memory. It can be used selectively for performance-critical tables or partitions, and Oracle Database will manage the population and eviction of data as needed.
* F (True):In-Memory column store can significantly improve performance for queries joining several tables, especially when bloom filters are used, as they are highly efficient with the columnar format for large scans and join processing.
The other options provided are not correct in the context of the In-Memory column store:
* A (False):While In-Memory column store is designed for analytical queries rather than caching results of function evaluations, it does not specifically avoid improving performance for queries using cached results of function evaluations.
* B (False):In-Memory column store can improve the performance of queries that use join groups, which can be used to optimize joins on columns from different tables.
* D (False):In-Memory column store can improve the performance of queries using expressions, including user-defined virtual columns, because it supports expression statistics which help in
* optimizing such queries.
References:
* Oracle Database In-Memory Guide:In-Memory Column Store in Oracle Database
* Oracle Database In-Memory Guide:In-Memory Joins
* Oracle Database In-Memory Guide:In-Memory Aggregation

NEW QUESTION # 34
A database instance is suffering poor I/O performance on two frequently accessed large tables.
No Big Table caching occurs in the database.
Examine these parameter settings:

Which are two actions either one of which will allow Big Table caching to occur?

A. Increasing DB_BIG_TABLE_CACHE_PERCENT_TARGET to at least 25
B. Increasing DB_CACHESIZE to 1 G
C. Setting DB_KEEP_CACHE_SIZE to at least 50M
D. Increasing DB_BIG_TABLE_CACHE_PERCENT_TARGET to at least 50
E. Setting PARALLEL_DEGREE_POLICYADAPTIVE
F. Setting PARALLEL_DEGREE_POLICYAUTO

Answer: A,B

Explanation:
Big Table caching is a feature that allows frequently accessed large tables to be cached in memory to improve I/O performance. From the parameter settings provided, Big Table caching is not occurring because DB_BIG_TABLE_CACHE_PERCENT_TARGETis set to 10, which is the minimum threshold for enabling the feature, but the size of the cache is too small for the big tables to be effectively cached.
To enable Big Table caching, one of the following actions could be taken:
* C (Correct):IncreasingDB_BIG_TABLE_CACHE_PERCENT_TARGETto at least 25. This action would allocate a larger percentage of the buffer cache for storing big tables, which could allow for caching large tables and thus improve I/O performance.
* D (Correct):IncreasingDB_CACHE_SIZEto 1G. Since the size of the buffer cache is a determining factor for how much data can be cached, increasing this parameter would provide more memory space for big tables to be cached.
Options A, B, E, and F will not enable Big Table caching because:
* A:IncreasingDB_BIG_TABLE_CACHE_PERCENT_TARGETto 50 without adjusting the overall size of the cache might still not be sufficient if theDB_CACHE_SIZEis not large enough to hold the big tables.
* B:SettingDB_KEEP_CACHE_SIZEto at least 50M only specifies a separate buffer pool for objects with the KEEP cache attribute and does not affect Big Table caching.
* E:andF:Changing thePARALLEL_DEGREE_POLICYtoADAPTIVEorAUTOinfluences the behavior of parallel execution but does not directly enable or influence Big Table caching.
References:
* Oracle Database Performance Tuning Guide:Big Table Caching
* Oracle Database Reference:DB_BIG_TABLE_CACHE_PERCENT_TARGET
* Oracle Database Reference:DB_CACHE_SIZE

NEW QUESTION # 35
......

1Z0-084 Latest Exam Practice: https://www.actual4dump.com/Oracle/1Z0-084-actualtests-dumps.html

P.S. Free & New 1Z0-084 dumps are available on Google Drive shared by Actual4dump: https://drive.google.com/open?id=1eV7megVntT-gGX8A16ahX9A246IaRMtC