http://www.br8dba.com/upgrade-oracle-database-from-11-2-0-4-to-12-2-0-1-using-dbua/
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Migration 11.2.0.4 vers 12.2.0.1 (en ligne de commande)
http://www.br8dba.com/tag/upgrade-oracle-database-manually-from-11-2-0-4-to-12-2-0-1/
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UPgrade 12CR1 to 12CR2
http://dbaclass.com/article/upgrade-database-from-12-1-0-2-to-12-2-0-1/
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Trouver les objets invalides dans la base
https://blog.devart.com/find-invalid-objects-in-your-databases.html