You must complete preparations before you can run an AutoUpgrade processing mode.

Before you can use an AutoUpgrade processing mode, confirm that you meet the following requirements:

• You have created a user configuration file.

• The source Oracle Database release is up and running in the original Oracle home. In case of a restart of AutoUpgrade, you must start the database in the Oracle home that corresponds to the phase in the upgrade flow.

• The server on which the database is running is registered on the server hosts file (for example, /etc/hosts), or on a domain name server (DNS).

  If you are logged in to the server on which the target database is located, and the database is running either on localhost, or where AutoUpgrade is running, then remove the hostname parameter from the AutoUpgrade config file.

• On container databases (CDBs), if you want to upgrade a subset of pluggable databases (PDBs), then the PDBs on which you want to run the upgrade are open, and they are configured in the user configuration file, using the AutoUpgrade local parameter pdbs. If you do not specify a list of PDBs, then AutoUpgrade upgrades all PDBs on the CDB.
• You have the AutoUpgrade jar file (autoupgrade.jar) downloaded or available, and you are able to run it using a Java 8 distribution.
• If you want to run AutoUpgrade in a batch or script , then you have called AutoUpgrade using the noconsole parameter in the command.

In Oracle Database 19c (19.3) and later target Oracle homes, the autoupgrade.jar file exists by default. However, before you use AutoUpgrade, Oracle strongly recommends that you download the latest version, which is available form My Oracle Support Document 2485457.1.