Oracle Database 12c: Installation and Administration — Question 43

You upgraded from a previous Oracle database version to Oracle Database version to Oracle Database 12c. Your database supports a mixed workload. During the day, lots of insert, update, and delete operations are performed. At night, Extract, Transform, Load (ETL) and batch reporting jobs are run. The ETL jobs perform certain database operations using two or more concurrent sessions.
After the upgrade, you notice that the performance of ETL jobs has degraded. To ascertain the cause of performance degradation, you want to collect basic statistics such as the level of parallelism, total database time, and the number of I/O requests for the ETL jobs.
How do you accomplish this?

Answer options

• A. Examine the Active Session History (ASH) reports for the time period of the ETL or batch reporting runs.
• B. Enable SQL tracing for the queries in the ETL and batch reporting queries and gather diagnostic data from the trace file.
• C. Enable real-time SQL monitoring for ETL jobs and gather diagnostic data from the V$SQL_MONITOR view.
• D. Enable real-time database operation monitoring using the DBMS_SQL_MONITOR.BEGIN_OPERATION function, and then use the

Correct answer: D

Explanation

The correct answer is D because using the DBMS_SQL_MONITOR.BEGIN_OPERATION function allows for real-time monitoring of database operations, providing insights into performance metrics. Options A and B do not focus on real-time statistics collection specific to the ongoing ETL jobs, and option C, while useful, does not provide the same level of detailed monitoring as option D.