--- max6395 wrote:

> I have developed an application with Delphi
> with Firebird 1.5.2 that manage a lot of database files;

You should really use 1.5.4 if possible.

> In some cases when i run the scrit over each database,
> for some database (not all), Firebird send this
> error "unsuccesful metadata object XXXX is
> un use".

http://www.firebirdfaq.org/faq22

HTH

David.