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?
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 DBMS_SQL_MONITOR.REPORT_SQL_MONITOR function to view the requiredinformation.
Explanation:
* Monitoring database operations
Real-Time Database Operations Monitoring enables you to monitor long running database tasks such as batch
jobs, scheduler jobs, and Extraction, Transformation, and Loading (ETL) jobs as a composite business
operation. This feature tracks the progress of SQL and PL/SQL queries associated with the business operation
being monitored. As a DBA or developer, you can define business operations for monitoring by explicitly
specifying the start and end of the operation or implicitly with tags that identify the operation.