Configure Exceptions for the Windows Firewall
If the Windows Firewall feature is enabled on one or more nodes of your Oracle RAC cluster, then you must create exceptions for Oracle RAC applications and ports.
Recompiling All Invalid Objects
Oracle recommends you run the utlrp.sql script after you install, patch, or upgrade a database, to identify and recompile invalid objects.
Configuring Services on Oracle RAC with CDBs
During installation, if you select a multitenant container database (CDB), and configure pluggable databases (PDBs), then Oracle recommends that you add services to the PDBs after installation.