If your DB Fault rate is consistently high, try adjusting the maxact for the storage pool. This may not be effective if you do not have enough RAM since the QPFRADJ system value should be set to auto adjus
Database Page Fault happens when the loaded page of the datafile needs to be swapped to get the next record. This will typically be high when doing random access which includes “sequential” reads using a key file.
If the file is reorganized (RgzPfm) based on the key that you are using then the page faults drop. Reorganizing files by key would be done perodically to clear the deleted record space.