the “resource” is a pre-defined oracle database system role that consists of the following permissions:

CREATE CLUSTER
CREATE INDEXTYPE
CREATE OPERATOR
CREATE PROCEDURE
CREATE SEQUENCE
CREATE TABLE
CREATE TRIGGER
CREATE TYPE

starting from Oracle 12cR1 this role doesn’t have “UNLIMITED TABLESPACE” system privilege, which is considered a security enhancement so the database user account won’t have any unlimited access to all tablespaces within the database. The DBA will be required to manually grant the specific tablespace quota to the user.