Solution : https://service.sap.com/sap/support/notes/960331 (SAP Service marketplace login required)
Key words : 
'knldiag' diagnosis file, start failed reason, subsequent database starts, service-specific error 2, error appears, database manager, service terminated, symptom maxdb 7, longer supported, awe parameters
Related Notes : 
       
| 814704 | MaxDB Version 7.6 parameter settings for OLTP/BW | 
| 793550 | Supplementary info about the MaxDB version upgrade to 7.6 |