Then each went to his own home

Lately it became very silent around del.icio.us. There are some new features but nothing groundbreaking. Either people are used to it and use it as a daily tool and there’s no need for new things or otherwise folks just don’t have faith in the future of del.icio.us.

I am a big fan of delicious. I’ve got 1.5K bookmarks there, I like it’s spirit and how open everything is. This article isn’t meant to criticize, but I think delicious is facing some problems.
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In my previous article named “Tags: database schemas” we analysed different database schemas on how they could meet the needs of tag systems. In this article, the focus is on performance (speed). That is: if you want to build a tagsystem that performs good with about 1 million items (bookmarks for instance), then you may want to have a look at the following result of my performance tests.
In this article I tested tagging of bookmarks, but as you can tag pretty much anything, this goes for tagging systems in general.

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While setting up the promised performance test in my last post, I did some tests with the MySQL fulltext features and it seems that they are built for tagging systems. Take a look at the queries (if it is not clear for you what is done here, please read my previous post).
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Recently, on del.icio.us mailinglist, I asked the question “Does anyone know the database schema of del.icio.us?” .
I got a few private responses so I wanted to share the knowledge with the world.

The Problem: You want to have a database schema where you can tag a bookmark (or a blog post or whatever) with as many tags as you want. Later then, you want to run queries to constrain the bookmarks to a union or intersection of tags. You also want to exclude (say: minus) some tags from the search result.
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