As long as the "Type:" is labeled "TEMP" it will - as a rule of thumb - go away. The error message is in fact adressed to the software developers of the application program, in this case DB/2. *They*, not you, should be concerned about this. In fact, they won't be and it is pointless to report it via a PMR, but thats a different story.
Are you experiencing any problematic symptoms - unresponsive machine, considerably (by order of magnitudes) slower operation of the database, etc.? If so, write it here, maybe we could help you. If you are just concerned about this error: forget it.