Solution : https://service.sap.com/sap/support/notes/979401 (SAP Service marketplace login required)
Key words : 
<password>    param_startsession    param_put <directory>    param_checkall    param_commitsessionsap standard, -sw_all unmount /sapdb/programsunmount /sapdb/data_servera, -sw_all unmount /sapdb/programsunmount /sapdb/data, si1 -sw_kernel unmount /sapdb/si1/db, /saphelp_nw2004s/helpdata/en/44/1549d945f71a74e10000000a1553f6/frameset, /sapdb/si1/db -start_xserver -start_db, database instance/sapdb/programs/bin/sdbreg -, dergistration/sapdb/programs/bin/sdbreg -, si1 -indep_data /sapdb/data -sw_kernel -, <installationpaths>/sapdb/si1/db mounted
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