Solution : https://service.sap.com/sap/support/notes/389051 (SAP Service marketplace login required)
Key words : 
45b sapkh45b20 46b sapkh46b04 solution, additional key words vl06o, component bc-db-ora, extremely long runtimes, program saplv50q terminates, runtime error time_out, runtime problem occurs, contact sap support, symptom data selection, inbound delivery monitor
Related Notes : 
       
| 196316 | VL06: Short dump DBIF_RSQL_INVALID_RSQL/Performance | 
| 170989 | Poor performance under Oracle 8044, 805*, 8.0.6 | 
| 127395 | Current patch set for Oracle Rel. 8.0.5 | 
| 113048 | Collective note on delivery monitor |