After applying some R19 maintenance that included PDT fixes and verifying the collections after the LPAR IPL, user noticed some strange -905 error in the PDT SQL error collection for 1 out of 7 systems. Even though the RLF table does not preempt SQL and allows all DDF threads 500M service units, PDT is reporting -905 errors for DDF work. The values in the errors are all 00000s which doesn't seem correct. After stopping and restarting the one collection in question the incorrect -905s errors stop all together even though the DDF threads are still running work non-stop.
This case is caused by the absence of IBM PTF UI38273. The absence of the PTF became a problem when user
switched a large production system using RLF to V11 NFM mode. The best course of action is to apply the missing IBM PTF.