This tutorial teaches you the followings:

Upgrading from Oracle Database Express Edition (XE) 18c to 21c.
Upgrading Oracle Database XE 18c/19c PDB to 21c.
How to export and import data between Oracle Database.
Moving from Previous Versions of Oracle Database to 21c.
Migrating Data and Applications.
Migrating from Oracle Database.
Oracle Database Upgrade.
Upgrade and or Migrate Oracle Database.

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