I have about 2,000 links with a text database (old links - not sql) and they are large with several additional fields. I would say with normal structure they are about 4,000 or more links.

I am moving them to sql version and so far to test out, I have only moved about 500 links and I am surprised that with links sql, the searches and dynamic pages are slower than the text database version. The searches take much longer than the static db.