Solution : https://service.sap.com/sap/support/notes/191191 (SAP Service marketplace login required)
Key words : 
undocumented profile parameter  rdisp/vb_key_long_hostname = 1, rdisp/vb_key_use_hostname profile parameter, support host names longer, rdisp/vb_key_comp parameter, dynp/trans_id_format parameter, unique universal identifier, accelerate sql operations, called dynp/luw_id_format, 8-digit hex code, sap service marketplace
Related Notes : 
       
| 1580019 | Invalid LUW ID | 
| 1094550 | Local update and update key in old format | 
| 1060314 | CST patch collection 23 2007 | 
| 1051296 | CST Patch Collection 19 2007 | 
| 957514 | CST Patch Collection 26 2006 | 
| 626763 | CST patch collection 24 2003 | 
| 626743 | Update key not unique | 
| 596243 | CST Patch Collection 08 2003 | 
| 122599 | DB2/390: Performance of the update |