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Re: [vox-tech] Call for SQL help
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Re: [vox-tech] Call for SQL help

Looks like MySQL 5.4 fixes that performance issue:


On Sat, Apr 18, 2009 at 6:01 PM, Brian Lavender <brian@brie.com> wrote:
On Fri, Apr 17, 2009 at 11:20:01AM -0700, Bill Kendrick wrote:
> On Thu, Apr 16, 2009 at 06:06:21PM -0700, Bryan Richter wrote:
> > 1. Definetely break out subqueries. A possible starting point would be creating a temp table of interesting categories. Temp tables are indispensible.
> >
> Ah, my predecessor popped up and mentioned this discovery.  Instead of
> the subselect ("AND bc.categoryid IN ( SELECT ... )"), doing the following
> 'EXISTS' test does the same thing.
> It now takes under 1 second, rather than 90 seconds.  A speed improvement
> of over 100x.  Yay :)
>   bill.beers_owed_to_people++;

I could go for some beer. Are you buying? :)

Brian Lavender
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