Solution : https://service.sap.com/sap/support/notes/303461 (SAP Service marketplace login required)
Key words : 
cd $oracle_home/dbs            cp /usr/sap/<sapsid>/sys/exe/run/sapdba_role, terms update migration release upgrade release maintenance level reason, edit script \usr\sap\put\bin\oragetnls, note date      topic    short description ----------------------------------------------------------------------19/apr/05  iii     note 16951, /     important general remarks    ii/    free space requirement, sql sqlplus internal @sapdba_role <sapsid> unixyou, file$oracle_home/dbs/init<sid>, file $oracle_home/dbs/init<sid>, note 189198--------------------------------------------------------------------- ii/ free space requirement, enhance storage parameter next_extents20/jul/00
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| 180430 | Installing the ORACLE client software for UNIX | 
| 3807 | Error messages regarding rollback and undo segments |