then it's some question like "how can i resolve my problem"
it's not an easy question that you can follow a rule then get what you want
usually you have to know what exactly you are looking for, for example you can start with the timestamp information from fmt file. You got the timestamp from db2diag.log for the error message (if there is) and start from there
or you know the function name that caused problem (usually may not good for you if you didn't work on hundreds of cases)
the bottomline is, you have to have some idea how to start the investigation (what do you want to know from the trace). It doesn't help any if you just collect data and don't know what need to do next, the plan should be already in your head before collecting the data....