Andy, Aha, that fixed it. The backup was taken after the last resetlogs (18-APR-2008) but the resetlogs_time in v$datafile_header for the read-only datafile is 12-FEB-2007. Thanks to all who replied. David Lord On 17/04/2008, Andy Rivenes <arivenes@xxxxxxxx> wrote: > Hi David, take a look at Metalink note 266991.1 - Recovering READONLY > tablespace backups made before a RESETLOGS Open. Since you're in > noarchivelog mode you may have problems, but this worked for me. -- //www.freelists.org/webpage/oracle-l