Is there a way to stop a rollback?

You can't stop the system from rolling back an aborted transaction. Since you killed the session, the transaction was aborted and the system has no choice but to rollback any changes you made. This system will not decide for you which abort transactions to keep and which to get rid of. So it rolls back all of them. Even if you shutdown the database and bring it back up, it will still perform rollback after the database is started. You'll just have to wait for it to finish. Once it is finished rolling back, you won't get the ORA-00054 error.

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