SAP Note 22451 - ORA01204

Symptom:

ORA01204, DB does not start after export

Cause and prerequisites

DB was not shut down correctly, computer crash.

Solution
1.) DB startup mount
2.) Set tablespaces to offline
3.) Drop tablespaces
-> Start database again.
4.) Create tablespaces again, delete files and import correct files
5.) Recover the tablespaces