After selecting the transactions, take multiple samples. It is best to have users run the transactions and have them watch you write down the timing result. This will increase their trust, which at this point is probably at an all-time low. You don't need to take 30 samples-3 to 5 will be enough to give you a good idea of the situation.3 Then write these down and perhaps post them so everyone knows the baseline.

Regardless of which tools you use, you will need interactive and historically focused tools. Each has a distinct focus, and most vendor-supplied tools naturally fall into one of these categories.

Interactive tools operate in real time. When you log in to Oracle using SQL*Plus and run a script, you are being interactive. Interactive tools have the distinct advantage of going technically very deep. All the data is available because the activity is happening now. Hyper-focused interactive tools usually have dazzlingly graphics. However, be aware that interactive tools do have limitations. During a firefight, there is usually a lot of chaos, and while you are focusing on one problem, another problem is occurring. If you are limited to interactive tools, you could miss a key investigative opportunity.