Solution : https://service.sap.com/sap/support/notes/525471 (SAP Service marketplace login required)
Key words : 
\usr\sap\put\bin\crshdusr, script\sap\put\bin\oragetnls, sql remote db oragetnls, protocol adapter error  sp2-0640, sysdbawithconnect system/<pwd> @<dbsid>, sql shdinst_sdb_chk dbchk_pre reason, windows nt/oracle, log log file, sysdbawithconnect /@<dbsid>, sql script
Related Notes : 
       
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| 662219 | Add. info. on upgrading to SAP Web AS 6.40 ORACLE | 
| 491598 | Additional info on upgrading to SAP Web AS 6.20 ORACLE 8.1.x | 
| 401721 | on upgrading to SAPWeb AS 6.10 ORACLE |