Automatic Database Diagnostic Monitor (ADDM): Unlocking Performance Secrets

When does ADDM run?

a. When an AWR snapshot is taken automatically by the MMON process
b. When an AWR snapshot is taken automatically by the MMNL process
c. When the Autotask process runs hourly to take workload snapshots
d. None of the above

Answer:

ADDM runs when an AWR snapshot is taken automatically by the MMON process.

The Automatic Database Diagnostic Monitor (ADDM) plays a crucial role in the performance tuning of Oracle databases. ADDM is a powerful tool that helps identify and resolve performance issues efficiently, ensuring optimal database performance.

ADDM produces its results using the data stored in the Automatic Workload Repository (AWR). By analyzing AWR snapshots taken automatically by the MMON process, ADDM can provide valuable insights into the database's performance. It is recommended to run ADDM during non-peak hours to minimize the impact on the database workload.

Some common recommendations provided by ADDM include improving memory management, optimizing SQL queries, and implementing partitioning for tables and indexes. By following these recommendations, database administrators can significantly enhance the overall performance of the database.

It is important to note that ADDM does not run automatically; it needs to be manually activated. The performance analysis process can be initiated from the Performance tab of Enterprise Manager or the command-line interface. Once the analysis is complete, administrators can review the findings and take necessary actions to address any performance issues identified by ADDM.