How to login

I just installed Oracle 9.0.1 on SUSE 9.
I started the listener.


How do I log in to the database? I am trying this:


sqlplus /nologin


SQL> connect / as sysdba
ERROR:
ORA_01031: insufficient privileges


I also tried scott/tiger without success.

Try sqlplus /nolog

Try sqlplus "/ as sysdba"

Is there a database created ?

sqlplus "/ as sysdba"
results in:
ORA_01031: insufficient privileges

Your not defined as a Oracle user on the database.
Try not to use OS authentication in the beginning until your db has been configurated
Use db authentication : system or sysdba user/password

conn system/system??@my_db?

I don't understand, if my hostname is sun9 and my DB name is test, how would this command look?

conn system/sun9@test

this returns

ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory