Solution : https://service.sap.com/sap/support/notes/1493434 (SAP Service marketplace login required)
Key words : 
arguments \usr\sap\<sapsid>\upg\java\config\dmt, log file <upgdir>\java\log\dbmcli_<number>, /    important general information               ii/   errors, /    important general information ii/   errors, execute dmt command runhandler, sap systemsthe phase terminates, linuxia64the database connection terminates, operating system user sidadm, sidadm operating system user, guide               iii/  activities prior
Related Notes : 
       
| 1617578 | Incorrect results for selects with correlated subquery | 
| 851105 | Deactivating the co-routines for MaxDB on UNIX systems |