it's normal and applies to some other metadata changes as well, at least for
firebird 1

>From: Juan Pedro L�pez S�ez <jpls@...>

>Is there any problem in adding new foreign key constraints when database
>is in use (there are client connections apart from the SYSDBA connection
>used to perform DDL statements)?
>
>After some tests, I've found I just can do it when nobody else is
>connected.
>
>Is this a common firebird rule or is it possible to change this
>behaviour?

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