Solution : https://service.sap.com/sap/support/notes/496165 (SAP Service marketplace login required)
Key words : 
abap runtime errors    dbif_dsql2_sql_error  sql error 980 occurred, correctly created user_ind_columns public synonym, formal public synonym user_ind_columns created, sysdba  drop synonym sapr3, executing exec sql syslog, user_ind_columns oracle standard object, user_ind_columns_rule auxiliary view optimized, user_ind_columns oracle ddic view, sql error 980 occurred, executing exec sql
Related Notes : 
       
| 662644 | Composite SAP Note: ORA-00942 | 
| 650796 | Composite Note: ORA-00980 | 
| 410963 | Removing private Oracle objects for 6.X0 kernels | 
| 114471 | Extremely long runtimes for display of index colmns |