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Oracle 1Z0-084 (Oracle Database 19c Performance and Tuning Management) Certification Exam is designed for professionals who are seeking to validate their skills and knowledge in the area of database performance and tuning management. 1z1-084 Exam covers a broad range of topics, including database performance tuning, SQL tuning, memory management, and database backup and recovery.
Oracle Database 19c Performance and Tuning Management Sample Questions (Q32-Q37):
NEW QUESTION # 32
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 capture directory is part of the root file system.
- E. The instance is unable to access the capture directory.
Answer: C,E
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
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NEW QUESTION # 33
Examine this statement and its corresponding execution plan:
Which phase introduces the CONCATENATION step?
- A. SQL Transformation
- B. SQL Execution
- C. SQL Semantic Check
- D. SQL Row Source Generation
- E. SQL Adaptive Execution
Answer: A
Explanation:
The CONCATENATION step in an execution plan is introduced during the SQL Transformation phase. This phase is part of the optimizer's query transformations which can include various techniques to rewrite the query for more efficient execution. The CONCATENATION operation is used to combine the results of two separate SQL operations, typically when there is an OR condition in the WHERE clause, as seen in the provided query.
References:
* Oracle Database SQL Tuning Guide, 19c
* Oracle Database Concepts, 19c
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NEW QUESTION # 34
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. Set OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES to TRUE.
- B. Set the CURSOR_SHARING parameter to FORCE.
- C. Increase the size of the library cache.
- 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: B,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
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NEW QUESTION # 35
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$SERV_MOD_ACT_STATS
- B. In $ORACLE_BASE/diag/rdbms/<db unique name>/<instance name>/trace
- C. In the current working directory
- D. By viewing V$SERVICE_STATS
Answer: A
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
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NEW QUESTION # 36
Which Optimizer component helps decide whether to use a nested loop join or a hash join in an adaptive execution plan?
- A. Automatic Reoptimization
- B. Statistics Collector
- C. Dynamic Statistics
- D. Statistics Feedback
- E. SQL Plan Directives
Answer: B
Explanation:
In an adaptive execution plan, the Optimizer makes runtime decisions between nested loop and hash joins using a statistics collector. The collector is a row source that collects statistics about the rows it processes and can adapt the plan based on the number of rows processed.
References:
* Oracle Database SQL Tuning Guide, 19c
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NEW QUESTION # 37
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