Solution : https://service.sap.com/sap/support/notes/954949 (SAP Service marketplace login required)
Key words : 
start 'user            ' tasksharedsq creating command failedsharedsq  +, -1err 54008 memory   free blocks size 24, 1err 54008 memory   free blocks size 40, 1    54000 memory   free blocks size 27608, 1    54000 memory   free blocks size 1048536, affects microsoft operating systems, memoryerr 54008 memory   required, 3010480err 54008 memory   allocated, 24408064err 54008 memory   supplement, 3010560err 54008 memory   limit
Related Notes : 
       
| 814704 | MaxDB Version 7.6 parameter settings for OLTP/BW |