sqlplus / as sysdba and rman target / in oracle 12.2.0.1 do not connect to open database
[oracle@b3 tmp]$ . oraenv
ORACLE_SID = [DEVDB1] ?
The Oracle base remains unchanged with value /u01/app/oracle
[oracle@b3 tmp]$ cd $ORACLE_HOME
[oracle@b3 db_1]$ pwd
/u01/app/oracle/product/12.2.0/db_1
[oracle@b3 db_1]$ sqlplus / as sysdba
SQL*Plus: Release 12.2.0.1.0 Production on Wed Oct 17 11:23:54 2018
Copyright (c) 1982, 2016, Oracle. All rights reserved.
Connected to an idle instance.
SQL> connect sys/password@devdb1 as sysdba
Connected.
[oracle@b3 db_1]$ rman target /
Recovery Manager: Release 12.2.0.1.0 - Production on Wed Oct 17 11:25:53 2018
Copyright (c) 1982, 2017, Oracle and/or its affiliates. All rights reserved.
connected to target database (not started)
Connecting with sqlplus / as sysdba and rman target / both show connect to an idle instance.