About Virtual Machine DB Systems

Oracle Cloud Infrastructure (OCI) offers DB systems on virtual machines.

There are two types of database systems (DB systems) on virtual machines:

• Single-node DB system: A 1-node DB system consists of one virtual machine.
• Multi-node RAC DB system: A 2-node DB system consists of two virtual machines.

If you must provision a DB system for development or testing purposes, a special fast-provisioning single-node DB system is available.

When you create a DB system, you select the Oracle Database edition and version that applies to the database on that DB system. You cannot change the selected edition. Depending on your selected Oracle Database edition and version, your DB system can support multiple pluggable databases (PDB). See the following Oracle Database licensing topic for information about the maximum number of pluggable and container databases (CDB) available for your selected Oracle Database version.

• Oracle Database 19c: Permitted Features, Options, and Management Packs by Oracle Database Offering

A DB system can have only a single Database Home, which in turn can have only a single database. A DB system database uses OCI block storage instead of local storage. You specify a storage size when you create the DB system, and you can scale up the storage as required at any time. To change the number of CPU cores on an existing DB system, you must change the shape of that DB system. For more information, see Change the Shape of a DB System.

Note:

The shape change operation takes place in a rolling fashion for multi-node RAC DB systems, enabling you to change the shape with no database downtime.