Solution : https://service.sap.com/sap/support/notes/1412879 (SAP Service marketplace login required)
Key words :
prerequisites performance problemto update requests, luw condenser merge statement reason, sap bw compression takes, sap bw compression, sap netweaver bw 7, db2 optimizer chooses, rsadmin parameter db6_force_compound_index, sap nw bw7, 01 bi abap sp07, check sap note 875986
Related Notes :
1427864 | DB6: Real Time Statistic Runtime during SAP BW Compression |