Thomas Feddersen wrote:
> after an update from samba-3.0.14anb1 to version 3.0.21a, samba is no  
> longer registred in the packages-database: "pkg_info" doesn't show  
> anything about samba and there is no corresponding entry in /var/db.

That shouldn't happen unless you ran out of disk space or modified
some parts of pkgsrc incorrectly.
 
> How can I update the database and properly register the existing  
> installation of samba?

I'd try to reinstall it:

pkg_delete samba # will probably fail, just ignore
make install

-- 
Christian