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Oracle Database 19c Performance and Tuning Management certification is designed for professionals who work with large-scale databases and want to improve their performance and scalability. Oracle Database 19c Performance and Tuning Management certification is ideal for database administrators, developers, and performance engineers who want to learn advanced techniques for optimizing database performance. Candidates who pass the 1Z0-084 Exam can demonstrate their proficiency in managing complex database environments and improving their performance.

Oracle 1Z0-084 Exam Syllabus Topics:

Topic	Details
Topic 1	Using Metrics, Alerts and Baselines: Monitoring of performance by using metric thresholds and alerts is discussed. It also focuses on the usage of AWR baselines for the monitoring of performance.
Topic 2	Tuning the Shared Pool: It covers the tuning of the shared pool in the Oracle database, including diagnosing and resolving performance problems related to the shared pool, as well as managing and tuning the result cache.
Topic 3	SQL Performance Management: This section focuses on the management of optimizer statistics, the use of the Optimizer Statistics Advisor, the leveraging of the SQL Access and SQL Tuning advisors to tune SQL statements, and the application of SQL Plan Management to improve SQL statement performance.
Topic 4	Using Real Application Testing: Usage of SQL Performance Analyzer to assess the impact of database changes is discussed in this topic. It also focuses on the usage of Database Replay to evaluate the impact of system change on performance.
Topic 5	Using Automatic Memory Management: It covers the use of Automatic Memory Management in the Oracle database, including the configuration of Automatic Shared Memory Management and Automatic Memory Management.
Topic 6	Tuning the Buffer Cache: The topic addresses delves into diagnosing and resolving performance problems related to the buffer cache, as well as diagnosing database I O issues. Additionally, the topic explains the configuration of Big Table Caching and Flash Cache.
Topic 7	Reducing the Cost of SQL Operations: This topic covers Shrinking Segments, Management of Chaining and Migration, and Configuration of Index and Table Performance Options. It also discusses configuration of table compression and diagnosis and tuning of space related issues.
Topic 8	Using Log and Trace Files to Monitor Performance: This topic covers the use of Alert Log to Monitor Performance. Moreover, it also discusses usage of Trace files to Monitor Performance.

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Oracle 1Z0-084 exam, also known as the Oracle Database 19c Performance and Tuning Management exam, is designed to test a candidate's knowledge and skills in managing and optimizing database performance in Oracle Database 19c environments. 1Z0-084 exam covers a range of topics, including performance tuning, SQL tuning, memory management, database resource management, and more. 1Z0-084 Exam is intended for database administrators, database developers, and other IT professionals who work with Oracle Database 19c.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q49-Q54):

NEW QUESTION # 49
Examine this statement and output:

Which two situations can trigger this error?

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

Answer: B,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 # 50
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. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
D. The performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.
E. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.

Answer: A,C

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 # 51
You need to collect and aggregate statistics for the ACCTG service and PAYROLL module, and execute:

Where do you find the output of this command?

A. By viewing V$SERVICE_STATS
B. In the current working directory
C. In $ORACLE_BASE/diag/rdbms/<db unique name>/<instance name>/trace
D. By viewing V$SERV_MOD_ACT_STATS

Answer: D

Explanation:
When you enable statistics gathering for a specific service and module using DBMS_MONITOR.
SERV_MOD_ACT_STAT_ENABLE, the output is aggregated and can be viewed using the V$SERV_MOD_ACT_STATS dynamic performance view. This view contains the cumulative statistics of database activity broken down by service and module, which is exactly what you collect when executing the provided command.
* B (Incorrect): While many types of trace files are located in the Diagnostic Destination directory (
$ORACLE_BASE/diag), the aggregated statistics for services and modules are not written to trace files but are instead viewable through dynamic performance views.
* C (Incorrect): The V$SERVICE_STATS view provides service-level statistics but does not provide the combined service/module-level breakdown.
* D (Incorrect): The output of the PL/SQL block is not written to a file in the current working directory; it is stored in the data dictionary and accessible via dynamic performance views.
References:
* Oracle Database PL/SQL Packages and Types Reference: DBMS_MONITOR
* Oracle Database Reference: V$SERV_MOD_ACT_STATS

NEW QUESTION # 52
An Oracle 19c database uses default values for all optimizer initialization parameters.
After a table undergoes partition maintenance, a large number of wait events occur for:
cursor: pin S wait on X
Which command reduces the number of these wait events?

A. ALTER SYSTEM SET SESSION CACHED CURSORS = 500;
B. ALTER SYSTEM SET CURSOR_SPACE_FOR_TIME - TRUE;
C. ALTER SYSTEM SET CURSOR_INVALIDATION = DEFERRED;
D. ALTER SYSTEM SET CURSOR_SHARING = FORCE;

Answer: C

Explanation:
Thecursor: pin S wait on Xwait event suggests contention for a cursor pin, which is associated with mutexes (a type of locking mechanism) that protect the library cache to prevent concurrent modifications. This issue can often be alleviated by deferring the invalidation of cursors until the end of the call to reduce contention.
The correct command to use would be:
* C (Correct):ALTER SYSTEM SET CURSOR_INVALIDATION=DEFERRED;This setting defers the invalidation of dependent cursors until the end of the PL/SQL call, which can reduce thecursor: pin S wait on Xwait events.
The other options are incorrect in addressing this issue:
* A (Incorrect):SettingCURSOR_SHARINGtoFORCEmakes the optimizer replace literal values with bind variables. It doesn't address the contention for cursor pins directly.
* B (Incorrect):CURSOR_SPACE_FOR_TIME=TRUEaims to reduce the parsing effort by keeping cursors for prepared statements open. It may increase memory usage but does not directly resolve cursor: pin S wait on Xwaits.
* D (Incorrect):IncreasingSESSION_CACHED_CURSORScaches more session cursors but doesn't necessarily prevent the contention indicated by thecursor: pin S wait on Xwait events.
References:
* Oracle Database Reference:CURSOR_INVALIDATION
* Oracle Database Performance Tuning Guide:Reducing Cursor Invalidation

NEW QUESTION # 53
Which application lifecycle phase could be managed reactively?

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

Answer: E

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 # 54
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THE BEST EXAM 1Z0-084 FORUM & LEADING PROVIDER IN QUALIFICATION EXAMS & COMPLETE 1Z0-084 RELIABLE EXAM LABS

The Best Exam 1Z0-084 Forum & Leading Provider in Qualification Exams & Complete 1Z0-084 Reliable Exam Labs