How to connect to different oracle instance as sysdba using sqlplus?

Question

When I run sqlplus it connect to orcl2 instance but I need to connect to orcl I can connect to my normal user using this:

sqlplus user/passowrd@//localhost:1521/orcl

but how can I connect as sysdba? I've try:

sqlplus / as sysdba@orcl

but it connect to orcl2 instance.

Answer 1

Set the ORACLE_SID environment variable to orcl.

Then sqlplus / as sysdba will connect to orcl as expected.