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To achieve the Oracle 1Z0-084 certification, candidates must pass a 120-minute exam consisting of 80 multiple-choice questions. 1Z0-084 exam covers topics such as performance tuning fundamentals, SQL tuning, memory management, and database resource management. Candidates must have a deep understanding of Oracle Database 19c architecture, configuration, and management to pass the exam.

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Oracle 1Z0-084 (Oracle Database 19c Performance and Tuning Management) Certification Exam is a highly sought-after certification exam for those who want to specialize in performance tuning and management of Oracle Database 19c. Oracle Database 19c Performance and Tuning Management certification exam is designed to test the candidate's knowledge and skills in managing and tuning the performance of an Oracle Database 19c. 1Z0-084 exam covers a wide range of topics including performance tuning methodology, database architecture, SQL tuning, memory management, and more.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q10-Q15):

NEW QUESTION # 10
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

A. The SGA size remains unaffected after disabling ASMM.
B. It requires a database instance restart to take effect.
C. All auto-tuned SGA components are reset to their original user-defined values.
D. Both SGA_TARGET and SGA_MAX_SIZE must be set to zero.
E. All SGA components excluding fixed SGA and other internal allocations are readjusted immediately after disabling ASMM.
F. All SGA components retain their current sizes at the time of disabling.

Answer: A,F

Explanation:
When ASMM is disabled, the sizes of the automatically managed SGA components remain at their current values. ASMM is controlled by theSGA_TARGETparameter. IfSGA_TARGETis set to a non-zero value, ASMM is enabled and Oracle will automatically manage the sizes of the various SGA components. When ASMM is disabled, by settingSGA_TARGETto zero, the SGA components that were automatically sized will retain their current sizes rather than being reset to their original user-defined values. The overall size of the SGA remains the same unless manually changed by modifying individual component sizes or SGA_MAX_SIZE.
References:
* Oracle Database Administration Guide, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 11
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$SERVICE_STATS
B. By viewing V$SERV_MOD_ACT_STATS
C. In the current working directory
D. In $ORACLE_BASE/diag/rdbms/<db unique name>/<instance name>/trace

Answer: B

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 # 12
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. Create the KEEP cache and cache tables accessed by the SQL statements.
B. Create the RECYCLE cache and cache tables accessed by the SQL statements.
C. Increase the size of the library cache.
D. Set the CURSOR_SHARING parameter to FORCE.
E. Set OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES to TRUE.

Answer: C,D

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 # 13
You are informed that the RMAN session that is performing the database duplication is much slower than usual. You want to know the approximate time when the rman operation will be completed.
Which view has this information?

A. V$SESSION
B. V$RMAN_BACKUP_JOB_DETAILS
C. V$SESSTAT
D. V$SESSION_LONGOPS

Answer: D

Explanation:
In Oracle Database, theV$SESSION_LONGOPSview provides insights into various operations within the database that are expected to take more than six seconds to complete. These include operations related to RMAN (Recovery Manager), such as database duplication tasks. This view displays information about the progress of these long-running operations, including the start time, elapsed time, and estimated time to completion.
When an RMAN session is performing a database duplication and is observed to be slower than usual, checking theV$SESSION_LONGOPSview can give an approximation ofwhen the RMAN operation might complete. This view includes fields likeTIME_REMAININGandELAPSED_SECONDSthat help in estimating the completion time of the operation based on its current progress.
References:
* Oracle Database Reference:V$SESSION_LONGOPS
* Oracle Database Backup and Recovery User's Guide:Monitoring RMAN Jobs

NEW QUESTION # 14
Which two types of performance problems are reported by ADDM for PDBS?

A. SGA sizing issues
B. Top SQL statements
C. User I/O waits
D. I/O capacity limits
E. Excessive checkpoint writes

Answer: C,D

Explanation:
The Automatic Database Diagnostic Monitor (ADDM) analyzes and reports on various types of performance problems. For Pluggable Databases (PDBs), it can identify issues such as I/O capacity limits which may hinder the overall performance by causing bottlenecks. Additionally, ADDM can report on user I/O waits, which can indicate performance issues related to the time it takes for user queries to read data from the disk.
References:
* Oracle Multitenant Administrator's Guide, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 15
......

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q10-Q15):

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