TOP 1Z0-084 LATEST CRAM MATERIALS FREE PDF | PASS-SURE RELIABLE 1Z0-084 EXAM SIMULATIONS: ORACLE DATABASE 19C PERFORMANCE AND TUNING MANAGEMENT

Top 1Z0-084 Latest Cram Materials Free PDF | Pass-Sure Reliable 1Z0-084 Exam Simulations: Oracle Database 19c Performance and Tuning Management

Top 1Z0-084 Latest Cram Materials Free PDF | Pass-Sure Reliable 1Z0-084 Exam Simulations: Oracle Database 19c Performance and Tuning Management

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To take the Oracle 1Z0-084 certification exam, individuals must have a solid understanding of Oracle Database 19c architecture and its performance tuning features. They should also be familiar with database monitoring tools, SQL tuning, and troubleshooting techniques. 1Z0-084 Exam consists of 80 multiple-choice questions and must be completed within 120 minutes.

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No doubt the Oracle Database 19c Performance and Tuning Management (1Z0-084) certification is one of the most challenging certification exams in the market. This 1Z0-084 certification exam gives always a tough time to Oracle Database 19c Performance and Tuning Management (1Z0-084) exam candidates. The ExamDumpsVCE understands this hurdle and offers recommended and real 1Z0-084 Exam Practice questions in three different formats. These formats hold high demand in the market and offer a great solution for quick and complete Oracle Database 19c Performance and Tuning Management (1Z0-084) exam preparation.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q39-Q44):

NEW QUESTION # 39
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 performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.
  • B. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
  • C. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.
  • D. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.
  • E. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.

Answer: B,D

Explanation:
A high buffer cache hit ratio typically indicates that the database is effectively using the buffer cache and does not often need to read data from disk. However, this metric alone is not a reliable indicator of the I/O performance of the database for several reasons:
* Full table scans and fast full index scans (A) can bypass the buffer cache by design if the blocks are not deemed reusable shortly, which can impact the cache hit ratio.
* A high cache hit ratio (B) can be misleading if the database performance is poor due to other factors, such as inefficient queries or contention issues.
* The buffer cache advisory (C) is a more valuable tool for understanding the potential impact of different cache sizes on the database's I/O performance. It simulates scenarios with different cache sizes and provides a more targeted recommendation.
* The RECYCLE and KEEP buffer caches (D) are specialized caches designed for certain scenarios.
While high hit ratios can be beneficial, they are not universally required; some workloads might not be significantly impacted by lower hit ratios in these caches.
* A lower cache hit ratio (E) does not necessarily mean poor I/O performance. In some cases, a system with a well-designed storage subsystem and efficient queries might perform well even with a lower cache hit ratio.
References
* Oracle Database 19c Performance Tuning Guide - Buffer Cache Hit Ratio
* Oracle Database 19c Performance Tuning Guide - v$db_cache_advice


NEW QUESTION # 40
You want to reduce the amount of db file scattered read that is generated in the database.You execute the SQL Tuning Advisor against the relevant workload. Which two can be part of the expected result?

  • A. recommendations regarding rewriting the SQL statements
  • B. recommendations regarding the creation of SQL Patches
  • C. recommendations regarding the creation of materialized views
  • D. recommendations regarding partitioning the tables
  • E. recommendations regarding the creation of additional indexes

Answer: C,E

Explanation:
The SQL Tuning Advisor provides recommendations for improving SQL query performance. This may include suggestions for creating additional indexes to speed up data retrieval and materialized views to precompute and store query results.References:
* Oracle Database SQL Tuning Guide, 19c


NEW QUESTION # 41
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 DBWRITERPROCESSES to 64,
  • 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 DB_FILE_MULTIBLOCK_READ_COUNT to 128

Answer: A,D

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 # 42
Examine this command:

What is the maximum number of baselines generated by this command that you can have at any given time?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: A

Explanation:
The DBMS_WORKLOAD_REPOSITORY.CREATE_BASELINE_TEMPLATE procedure is used to create a repeating baseline template in the Automatic Workload Repository (AWR). This template will generate baselines for a specified duration of time on a repeating schedule. The parameters of the CREATE_BASELINE_TEMPLATE procedure include the start and end times, as well as the day of the week and hour in the day when the baseline should be captured.
Given that the command specifies a repeating baseline every Monday at 5 PM with a duration of 3 hours and it expires after 30 days, the number of baselines generated by this command that you can have at any given time depends on how many Mondays fall within the most recent 30-day period.
Since the maximum number of Mondays that can occur within any 30-day period is 5 (four to five weeks), but considering the baseline has a duration of 3 hours and starts every Monday at 5 PM, only one baseline for each Monday can exist at a time. However, since baselines are preserved for 30 days, you could have multiple instances of Monday baselines preserved at a time.
* A (Incorrect): There can be more than one baseline at a time because the template will generate a baseline for every Monday during the 30-day expiration period.
* B (Incorrect): There will be more than three baselines because the template creates a baseline for every Monday within the 30-day expiration period.
* C (Correct): Over a 30-day period, considering the duration of the baselines and their frequency, you could have up to a maximum of 52 baselines if you consider the entire year.
* D (Incorrect): There is no option that restricts the number of baselines to 5 specifically, the answer relies on the calculation of how many baselines can exist over a period of time considering their expiration.
References:
* Oracle Database PL/SQL Packages and Types Reference: DBMS_WORKLOAD_REPOSITORY


NEW QUESTION # 43
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 the ftatspack repository and import it by using impdp into the AWR repository.
  • B. Export the data by using expdp from Statspack and import it by using $ORACLE_HOME/rdbms/admin
    /awrload 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 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 # 44
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