So you've run into a DB2 problem and you are going to open a PMR so you can get the support team to help you out. In many cases you are well educated in DB2 but don't have enough info to solve the concern yourself.
This is where the Collecting Data documents come into play. They are also know as Must Gather information. "Must" is a bit of a strong word but a good one to convey the fact that if you do open a PMR we will probably ask you to gather certain information based on the type of issue you are facing.
Have a look at this technote technote that talks about why it is good to gather the information early or before you open the PMR.
Also visit this page for a list of the DB2 LUW Must Gathers.
I've also been tweeting about these and other tips. Follow me on Twitter to get the information.