Solution : https://service.sap.com/sap/support/notes/564019 (SAP Service marketplace login required)
Key words : 
keycard freqval numcols 2 count 10 change shrlevel, terms document flow reason, accessing database table vtfa, shipment document flow vtfa, shipment document flow, sd document flow, archiving object sd_vttk, attached correction instructions, ibm utility runstats, runstats tablespace <dbname>
Related Notes : 
       
| 938279 | |
| 394413 | Long runtime when displaying shipment | 
| 380848 | Bad performance when archiving SD_VTTK | 
| 369658 | SD document flow: Long runtimes when reading transport doc. | 
| 162034 | DB2/390: Database hints in Open SQL | 
| 129385 | Database hints in Open SQL |