Solution : https://service.sap.com/sap/support/notes/811031 (SAP Service marketplace login required)
Key words : 
sap ifi performance data collector, sap transaction sm50, /os sm50 reason, prerequisites - solution apply, work process issued, sap system, work process, process overview, detail view, sql statement
Related Notes : 
       
| 427748 | DB2-z/OS: CCMS corrections (6.10, 6.20, 6.40, 7.x) | 
| 426863 | DB2-z/OS: DB Performance Monitor/IFI Data Collector |