Oracle Multitenant Architecture: CDB and PDB Internals for Architects
Oracle Multitenant was introduced in 12c and is now the default deployment model. Despite broad adoption, the internal mechanics of how CDBs and PDBs share and isolate resources are frequently misunderstood. This article is for architects designing multitenant deployments who need to reason about performance isolation, resource governance, and operational boundaries. CDB vs Non-CDB: The Core Difference In a non-CDB, the database owns the entire Oracle instance. In a CDB: ...