[ora10] Cloning database, Unknown command 'DATAFILE'

Hi,

I'm trying to clone a database. I use (e.g. from http://www.dba-oracle.com/oracle_tips_db_copy.htm): alter database backup controlfile to trace as 'D:\ctrl_old.sql' resetlogs;

When I try to execute @D:\ctrl_old.sql I get an error:

SP2-0042: Unknown command 'DATAFILE'.

What did I miss?

Thanks, Helmut

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