You can consolidate PDBs into a single CDB to achieve economies of scale, while maintaining isolation between PDBs. You cannot add or modify objects in PDB$SEED.įor an application, a PDB is a self-contained, fully functional Oracle database. The seed PDB is a system-supplied template that the CDB can use to create new PDBs. An application seed is an optional application PDB that acts as a user-created PDB template, enabling you to create new application PDBs rapidly. For example, the cust1_pdb and cust2_pdb application PDBs might belong to the saas_sales_ac application container, in which case they belong to no other application containers. If a PDB belongs to an application container, then it is an application PDB. You add PDBs based on your business requirements.Ī PDB belongs to exactly zero or one application container. For example, a PDB can support a specific application, such as a human resources or sales application. An application root belongs to the CDB root and no other container.Ī PDB contains the data and code required for a specific set of features (see " PDBs"). Whereas the system container contains the CDB root and all the PDBs within the CDB, an application container includes only the PDBs plugged into the application root. Thus, the system container is the logical container for the CDB itself.Īn application container consists of exactly one application root, and the PDBs plugged in to this root. The system container includes the root CDB and all PDBs in the CDB. A common user is a database user known in every container (see " Common User Accounts"). An example of metadata is the source code for Oracle-supplied PL/SQL packages. The root stores Oracle-supplied metadata and common users. The CDB root is a collection of schemas, schema objects, and nonschema objects to which all PDBs belong (see " CDBs and PDBs"). Description of "Figure 2-1 Containers in a CDB"Įxactly one CDB root container (also called simply the root)
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