By Robin Schumacher
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Additional resources for Oracle Performance Troubleshooting With Dictionary Internals SQL & Tuning Scripts
A good DBA covets his complicated SQL scripts that dig into the heart of a database's internals and regurgitate mountains of difficult-to-interpret statistics. But, do those down-in-the-database DBAs really know what to do with all the information produced through performance monitors and SQL scripts? How does a DBA effectively monitor a database for performance and make a difference in-the response time and the user's experience? The key to understanding the discipline of performance monitoring is this: When you monitor a database for performance, you are really validating your physical design implementation.
This is where wait-based or bottleneck analysis comes into play. DBAs use this form of performance analysis to determine if perceived bottlenecks in a database are contributing to a performance problem. Bottleneck analysis is a valid method of measuring performance because it helps a DBA track where a database has been spending its time. If latch contention or heavy table-scan activity has been dragging a database's performance down, a DBA can use bottleneck analysis to confirm the actual root cause.
This is one case where a good change control tool can save you. Nearly every good tool in this category offers a synchronization feature that allows a DBA to compare an up-and-running database with a saved snapshot of that database's, object definitions. Once differences are identified, a click of the mouse can restore any missing objects. But, a change control tool can also help you in your physical design iterations. By periodically capturing changes you make to the physical design of your database, you can learn what worked and what did not.