To simplify upgrades to Oracle Database 21c, AutoUpgrade automates steps to convert a database from a non-CDB to a PDB as part of a database upgrade.
Oracle Database 21c requires multitenant architecture. With this release, you can use AutoUpgrade for non-CDB to PDB upgrades from Oracle Database 12c Release 2 (12.2) and later releases. Using the automation features of AutoUpgrade reduces both the effort required of DBAs for upgrades, and the risk associated with typographical errors in a manual process.
This practice shows how to upgrade one or many databases using the AutoUpgrade tool without human intervention, and amongst the databases, a non-CDB upgrade to a PDB.