Intrepid Blog » long keys http://blog.affien.com A few thoughts Mon, 01 Mar 2010 00:58:01 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 Long mySQL keys http://blog.affien.com/archives/2006/12/03/long-mysql-keys/ http://blog.affien.com/archives/2006/12/03/long-mysql-keys/#comments Sun, 03 Dec 2006 22:58:03 +0000 Bas Westerbaan http://blog.w-nz.com/archives/2006/12/03/long-mysql-keys/ Instead of limiting your long key (for instance a path) to approximately 800 characters (on mySQL with generic UTF8), you can hash your key and store the hash as index.

The drawback is that you need to use a quite good hash function to avoid duplicates if you want to use it for a unique or primary key. These good hash functions tend to require some computing time.

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