> thanks for that - I tried it out, fixed the minor typos and it ran at almost > the same speed! Any other ideas?
Could you post an explain analyze for both queries? There is always an application change. Add a trigger onto msg that will bump the date and count on msg_sum when a msg is added. This will support virtually unlimited msg table growth (any aggregate will eventually be slow on a large table). Just be sure to vacuum the msg_sum table regularly (once per 25% turnover) -- possibly as often as once a minute!
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