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Oracle 1Z0-084 exam evaluates a candidate’s knowledge of Oracle Database architecture, database memory management, performance analysis, database monitoring and optimization, and performance tuning techniques. Candidates must also be well-versed in diagnosing and resolving performance issues that affect database performance and stability. By passing the Oracle 1Z0-084 exam, candidates can become a recognized expert in the Oracle Database 19c performance and tuning management domain, which is essential for managing large databases with hundreds of users.

Oracle 1Z0-084 is a certification exam designed for professionals who wish to demonstrate their knowledge and skills in performance and tuning management of Oracle Database 19c. 1z1-084 Exam is targeted towards database administrators, developers, and architects who are responsible for optimizing the performance of Oracle Database 19c in their organizations. Oracle Database 19c Performance and Tuning Management certification exam covers various topics such as tuning the database instance, SQL performance tuning, memory management, and more.

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Oracle 1Z0-084 exam is focused on assessing a candidate's knowledge and skills in Oracle database 19c performance and tuning management. It is designed for database administrators, performance analysts, and other professionals who are involved in managing the performance of Oracle database systems. Passing 1z1-084 Exam demonstrates that an individual has a comprehensive understanding of the key concepts and techniques required to optimize Oracle database performance and ensure high levels of availability and reliability.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q42-Q47):

NEW QUESTION # 42
Which two Oracle Database features use database services?

A. Oracle Automatic Reoptimization
B. Oracle SQL Tuning Advisor
C. Database Resource Manager
D. Oracle SQL Performance Management
E. Oracle Scheduler

Answer: C,E

Explanation:
Database services in Oracle are used to manage how resources are allocated and how workloads are managed within the database. The features that use database services are:
* B (Correct):Database Resource Manager (DBRM) uses services to control resource allocation to different workloads. It ensures that resources are assigned to the most critical tasks first, based on the service associated with the workload.
* E (Correct):Oracle Scheduler can also utilize database services. Jobs in Oracle Scheduler can be assigned to different services to control resource allocation and prioritization.
The other features mentioned are related to SQL performance but do not directly utilize database services in the way Resource Manager and Scheduler do:
* A:Oracle Automatic Reoptimization is a feature that allows the database to automatically improve the execution plan of a SQL statement after it is executed, based on the actual performance metrics, but it does not directly use database services.
* C:Oracle SQL Performance Management involves various components of SQL tuning and monitoring, but it does not use database services to operate.
* D:Oracle SQL Tuning Advisor provides advice on how to tune SQL queries for better performance.
While it can be used in conjunction with services for managing and analyzing workloads, it doesn't use services in its core functionality.
References:
* Oracle Database Administrator's Guide:Administering Services
* Oracle Database Administrator's Guide:Managing Resources with Oracle Database Resource Manager
* Oracle Database Scheduler Developer's Guide:Using the Scheduler

NEW QUESTION # 43
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 # 44
Which two statements are true about session wait information contained in v$session or v$session_wait?

A. Rows for sessions that are not waiting might contain the actual wait time for the last event for which they waited.
B. Rows for sessions that are not waiting always contain the total wait time since the session started.
C. Rows for sessions that are currently waiting have a wait time of 0.
D. Rows for sessions displaying WAITED UNKNOWN TIME in the STATE column indicate that the session is still waiting.
E. Rows for sessions that are currently waiting have their wait time incremented every microsecond.

Answer: A,C

Explanation:
In theV$SESSIONview, Oracle provides information about the session waits:
B: When theWAIT_TIMEcolumn has a value of 0, it signifies that the session is currently waiting for a resource. This column represents the duration of the current or last wait.
C: If the session is not actively waiting, theWAIT_TIMEcolumn shows the time the session spent waiting for the last wait event. If theSTATEcolumn is showing "WAITED KNOWN TIME", it means the session is not currently waiting, but it indicates the time for which it had waited.
References:
* Oracle Database Reference, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 45
You execute the following:
EXECUTE DBMS_AuTO_TASK_ADMIN.DISABLE;
Which advisor remains enabled?

A. Optimizer Statistics Advisor
B. Automatic Optimizer Statistics Collection
C. Automatic Segment Advisor
D. SQL Plan Management Evolve Advisor
E. Automatic SQL Tuning

Answer: B

Explanation:
When you executeDBMS_AUTO_TASK_ADMIN.DISABLE, it disables all automated maintenance tasks related to the Auto Task framework. This includes tasks such as the Automatic SQL Tuning Advisor, Automatic Segment Advisor, and others. However, the Automatic Optimizer Statistics Collection (D) remains enabled as it is not part of the Auto Task framework. The gathering of optimizer statistics is controlled separately and is a critical part of the database's self-tuning mechanism to ensure the optimizer has up-to-date information about the data distribution within tables and indexes.
References
* Oracle Database 19c PL/SQL Packages and Types Reference - DBMS_AUTO_TASK_ADMIN
* Oracle Database 19c Database Administrator's Guide - Managing Optimizer Statistics

NEW QUESTION # 46
Examine this AWRreport excerpt:

You must reduce the impact of database I/O, without increasing buffer cache size and without modifying the SQL statements.
Which compression option satisfies this requirement?

A. COLUMN STORE COMPRESS FOR QUERY HIGH
B. STORE COMPRESS
C. MN STORE COMPRESS FOR QUERY LOW
D. ROW STORE COMPRESS ADVANCED

Answer: D

Explanation:
To reduce the impact of database I/O without increasing the size of the buffer cache and without modifying SQL statements, you can use table compression. Among the given options,ROW STORE COMPRESS ADVANCEDis the most suitable form of table compression to satisfy this requirement.
Advanced row compression (ROW STORE COMPRESS ADVANCED) is designed to work well with all supported types of data, whether it's OLTP or data warehouse environments. It offers a higher level of compression than basic table compression (ROW STORE COMPRESS BASIC)without significant overhead during DML operations. This feature can help reduce the amount of I/O required to retrieve data by storing it more efficiently on disk.
* A, B, D:WhileCOLUMN STORE COMPRESS FOR QUERY HIGHandROW STORE
COMPRESSare both valid compression types,COLUMN STORE COMPRESS FOR QUERY
* HIGHapplies to the In-Memory column store and is not available in all versions and editions, andROW STORE COMPRESSis less advanced thanROW STORE COMPRESS ADVANCED.
References:
* Oracle Database Concepts Guide:Table Compression
* Oracle Database Performance Tuning Guide:Row Compression

NEW QUESTION # 47
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