Managing a large multitenant database with many pluggable database can be a difficult task. Many PDBs fight for the server resources like I/O, CPU and memory. It can be difficult to keep the SLAs agreed with your customers. Oracle Database 12c Release 2 offers improvments in resource management for PDBs and a new feature called „Lockdown Profiles“ which helps you to limit the available features on PDB level. The talk shows the various areas of these two features in a CDB environment and shows how they will help you managing a multitenant environment. And both features can help even with a single-tenant database. Additionally, the presentation covers the new 21c feature "DBNest".