Cannot login oracle database using other users I'm currently using oracle xe c18.  I can login using sqlplus / AS SYSDBA as oracle user.  However, the command does not work for other users.  It always shows an error ORA-01017: invalid username/password; logon denied.  I already give SUID and GUID to all installation files.  What's the problem?
The syntax you gave is using 'os authentication' to connect.  That is, the OS user issuing the command is a member of the os group &quot;DBA&quot;.  (Or, on Windblows, &quot;ORA_DBA&quot;).  I hope you did not change ownership or permission of any of the files.