Read about the changes to the performance explorer database files.
ADDPEXDFN command
TRCTYPE(*HEAP) is a new trace type that selects all of the heap events from the STGEVT (storage events) parameter.
Migration of performance explorer database files
When you migrate to a new release of i5/OS™, if the system finds incompatible PEX database files, it moves these files to the QPEXDvrmxx library.