> Is it safe to unlock (nbackup -N) a database when there's a quite large delta
> file present and there are clients connected?

Yes.

Please, however, ensure you are running the latest FB release or review the latest release notes to ensure you are aware of the fixed bugs.

BTW, define "large".

> Will the server manage merging delta into the db and handling new updates
> at the same time?

Yes.

The engine will work to merge the changes as quickly as possible and will serve pages/requests at the same time.


Sean