xirium - thanks very much for your help. Unfortunately, most of the constraints are in the form of A>10, etc... I am using MyISAM now, but I am going to give

xirium - thanks very much for your help. Unfortunately, most of the constraints are in the form of A>10, etc... I am using MyISAM now, but I am going to give MEMORY a try after some of the comments on this post. There are no ORDER BY clauses.