Cannot login oracle database using other users

Question

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?

Answer 1

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 "DBA". (Or, on Windblows, "ORA_DBA"). I hope you did not change ownership or permission of any of the files.