Solution : https://service.sap.com/sap/support/notes/878742 (SAP Service marketplace login required)
Key words : 
ini_lock-rw-rw-rw-  1 sqdhwf sapsys    68 2005-08-10 14, ini_lock-rw-rw-rw-  1 root   sys       68 2005-08-10 14, files /usr/spool/sql/ini/sap_dbtech, -rw-r--r--  1 sqdhwf sapsys    68 2005-08-10 14, -rw-r--r--  1 root   sys       68 2005-08-10 14, /usr/spool/sql/ini/sap_dbtech, dbmcli command db_enum returns, lock file access authorizations, terms permission denied, empty database list
Related Notes : 
       
| 832561 | Additional information about the upgrade to liveCache 7.6 | 
| 793550 | Supplementary info about the MaxDB version upgrade to 7.6 |