Creating Oracle Multitenant Databases - OCP: Oracle Database 12c Administrator Certified Professional - page 512

FiGURe 11.6 DBCA Progress Page final screen
Now that you have created your CDB and first PDB, you can access the CDB through
the command line via SQL*Plus or by using Oracle Enterprise Manager Database Express
Edition at the URL provided.
Creating a CDB Using SQL* Plus
Oracle strongly recommends that you utilize the DBCA to create new databases, including
CDBs. However, you can utilize SQL*Plus to create a new CDB manually.
To create a new CDB, use the CREATE DATABASE ... ENABLE PLUGGABLE DATABASE SQL
statement. If you do not include the ENABLE PLUGGABLE DATABASE clause, the new database
is created as a non-CDB and can never host PDBs.
In Exercise 11.1, we will walk you through the steps to create a CDB using
SQL*Plus.