At the moment I work with one of our reference customers, Swiss Mobiliar Insurance, on their Multitenant upgrade to Oracle Database 126.96.36.199. And we encountered an “interesting” issue. After upgrade we received an ORA-44787 making it impossible to switch between containers with “
alter session set container=pdb1;” commands. Lesson learned now: If you don’t want ORA-44787 – Don’t mess with the Default Oracle Service.
What has happened?
Very simple case. We approach a database upgrade with a Multitenant deployment of over 90 PDBs. Source database version is Oracle Database 188.8.131.52.BP170117, destination version is Oracle Database 184.108.40.206.RU170718. …Continue reading...