Ora-20000 : Direct Downgrade Of EM Database Control Not Supported Despite Sysman User Is Dropped
(Doc ID 1292035.1)
Last updated on OCTOBER 24, 2019
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
This is a known issue and documented in <Document 443890.1>. As a resolution of this issue, one need to execute below step and then do the downgrade
DROP USER sysman CASCADE;
Even after running the above step, same error is received again and again.
Once a SYSMAN user is dropped successfully and if tried again the user should get a message 'SYSMAN' does not exist. But in this case, the message "SYSMAN is dropped" keeps appearing all the time.
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