"which refuses to start" --> What is the error that you receive on startup? >>>>> The error it __gave__ was "UNDOTbs1.dbf size X is smaller than Y blocks". "The crashed database is deleted now and I only have the datafiles of the crashed database somewhere on my filesystem" --> If I read this carefully you are contradicting yourself here.... not? >>>>> After trying to get the database to start for about a full day, we just did a file system backup of all the files belonging to the crashed db and later on went on to create a new db with the same name. We couldn't change the name of the db, because a lot of developers were on this crashed db :( Regards, Srinivas.