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Oracle 1Z0-084 certification exam validates a candidate's expertise in performance and tuning management for Oracle Database 19c. 1z1-084 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 1Z0-084 exam consists of 70 multiple-choice questions that must be completed within 105 minutes. 1z1-084 Exam covers a wide range of topics, including database architecture, instance tuning, SQL tuning, memory management, and performance monitoring. Candidates must have a thorough understanding of Oracle Database 19c, as well as experience with performance tuning and management tools such as Automatic Workload Repository (AWR), Automatic Database Diagnostic Monitor (ADDM), and Enterprise Manager Cloud Control.

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

NEW QUESTION # 19
The CURS0R_SHARING and OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES parameters are set to default. The top five wait events in an awr report are due to a large number of hard parses because of several almost identical SQL statements.
Which two actions could reduce the number of hard parses?

A. Increase the size of the library cache.
B. Set OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES to TRUE.
C. Set the CURSOR_SHARING parameter to FORCE.
D. Create the KEEP cache and cache tables accessed by the SQL statements.
E. Create the RECYCLE cache and cache tables accessed by the SQL statements.

Answer: A,C

Explanation:
To reduce the number of hard parses due to several almost identical SQL statements, you can take the following actions:
* C (Correct): Increasing the size of the library cache can help reduce hard parses by providing more memory to store more execution plans. This allows SQL statements to be shared more effectively.
* E (Correct): Setting the CURSOR_SHARING parameter to FORCE will cause Oracle to replace literals in SQL statements with bind variables, which can significantly reduce the number of hard parses by making it more likely that similar SQL statements will share the same execution plan.
The other options do not directly impact the number of hard parses:
* A (Incorrect): Creating the KEEP cache and caching tables accessed by the SQL statements can improve performance for those tables, but it does not directly reduce the number of hard parses.
* B (Incorrect): Creating the RECYCLE cache and caching tables accessed by the SQL statements can make it more likely that objects will be removed from the cache quickly, which does not help with hard parse issues.
* D (Incorrect): Setting OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES to TRUE can help stabilize SQL execution plans but will not reduce the number of hard parses. This parameter is used to automatically capture SQL plan baselines for repeatable SQL statements, which can prevent performance regressions due to plan changes.
References:
* Oracle Database Performance Tuning Guide: Minimizing Hard Parses
* Oracle Database SQL Tuning Guide: CURSOR_SHARING

NEW QUESTION # 20
Examine this statement and output:

Which two situations can trigger this error?

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

Answer: C,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 # 21
Examine these commands, which execute successfully:

Which statement is true?

A. AWR snapshots can be purged manually in pluggable databases.
B. ADDM, AWR, and ASH reports can be purged automatically.
C. AD DM is enabled for all pluggable databases.
D. AWR- snapshots in all pluggable databases will be purgedautomatically after every 60 mins.

Answer: A

Explanation:
TheDBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGSprocedure allows setting attributes related to AWR snapshots. While the interval setting controls the frequency of snapshot generation, purging them is a separate process that can be managed either automatically (with retention settings) or manually.References:
* Oracle Database PL/SQL Packages and Types Reference, 19c
* Oracle Multitenant Administrator's Guide, 19c

NEW QUESTION # 22
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. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.
E. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.

Answer: B,E

NEW QUESTION # 23
Examine this code block, which executes successfully:
DBMS_SERVER_ALERT. SET_THRESHOLD (
DBMS_SERVER_ALERT.CPU_TIME_PER_CALL, DBMS_SERVER_ALERT. OPERATOR_GE, '8000', DBMS_SERVER_ALERT.OPERATOR_GE, '10000', 1, 2, 'inst1', DBMS_SERVER_ALERT.OBJECT_TYPE_SERVICE, 'main.regress.rdbms.dev.us.example.com') ;

What will happen?

A. A warning alert will be issued only when CPU time exceeds 10000 microseconds for each user call.
B. A critical alert will be issued when CPU time exceeds 2 minutes for each user call.
C. A warning alert will be issued when CPU time exceeds 1 minute for each user call.
D. A critical alert will be issued when CPU time exceeds 10000 microseconds for each user call.

Answer: D

Explanation:
In the provided code block, theDBMS_SERVER_ALERT.SET_THRESHOLDprocedure is used to set alert thresholds for the CPU time per call in Oracle Database. This procedure is a part of Oracle's Database Server Alert system, which monitors various metrics and generates alerts when certain thresholds are exceeded.
The parameters passed to theSET_THRESHOLDprocedure are as follows:
* The first parameterDBMS_SERVER_ALERT.CPU_TIME_PER_CALLspecifies the metric for which the threshold is being set, in this case, the CPU time consumed per database call.
* The second and third parametersDBMS_SERVER_ALERT.OPERATOR_GEand'8000'specify the warning threshold level and its value, respectively. However, these are not relevant to the answer as they are overridden by the critical threshold settings.
* The fourth and fifth parametersDBMS_SERVER_ALERT.OPERATOR_GEand'10000'set the critical threshold level and its value. This means that a critical alert will be generated when the CPU time per call exceeds 10000 microseconds.
* The remaining parameters specify the warning and critical alert intervals, the instance name, the object type, and the service name. These are not directly relevant to the behavior described in the options.
Thus, the correct answer is B, as the critical threshold for CPU time per call is set to 10000 microseconds, and the system is configured to issue a critical alert when this threshold is exceeded.
References:
* Oracle Database 19c documentation on theDBMS_SERVER_ALERT.SET_THRESHOLDprocedure, which details the parameters and usage of this procedure for setting alert thresholds within Oracle Database monitoring system.
* Oracle Database Performance Tuning Guide, which provides best practices and methodologies for monitoring and tuning Oracle Database performance, including the use of server alerts and thresholds.

NEW QUESTION # 24
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