React to out-of-line situations
Up-to-date performance data is used to quickly react to out-of-line situations.
This task is often driven by user concerns about the performance of DB2® applications. It can also be driven by unexpected results observed in basic reports described previously. If such problems prove to be related to buffer pools or group buffer pools, they require in-depth analysis.
You need to be able to recognize these problems quickly and to react to them quickly. Your immediate needs are up-to-date performance information at several levels of detail, usually beginning with summary information, followed by more detailed information. This information must reflect the performance from the time that applications were observed to run slowly, or when summary report information shows unexpected behavior.