From: | Josh Berkus <josh(at)agliodbs(dot)com> |
---|---|
To: | sfpug(at)postgresql(dot)org |
Subject: | Re: Using bitwise operator vs. mapping table |
Date: | 2007-10-16 15:08:06 |
Message-ID: | 200710160808.07024.josh@agliodbs.com |
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Lists: | sfpug |
Brian,
> They aren't terrible today and I suspect there is some low hanging
> optimization that could be collected by a real DBA. However, we're
> growing and our users run quite a lot of reports which already do 5 or
> 6-way joins.
Do you expect that the number of joins would actually increase, though?
> Are there any benefits other than speed in the denormalized approach?
No, so you only want to do it if you have a real performance problem which
you've already tried to solve other ways.
If you want the "rollup" view of the attributes table, you can always create a
custom aggregate which displays a list.
> Once I get through this PCI DSS effort I may hire someone to get that
> low-hanging fruit but I am trying to keep this other dev work moving
> forward in the mean time.
Good idea.
--
Josh Berkus
PostgreSQL @ Sun
San Francisco
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