Oracle 12c and 18c Multitenant Container databases were designed to consolidate databases. The provisioning and management advantages of using pluggable databases greatly simplify database operations. However, the database security model becomes more complex to accommodate pluggable databases. This session will provide a deep dive into authentication and authorization when using the multitenant option, including users, roles, profiles, and privileges.  Challenges and nuances in managing the security of a multitenant database will be highlighted.