| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Cc: | Mark Wong <markw(at)osdl(dot)org> |
| Subject: | Re: DBT-3 Query 2 EXPLAIN ANALYZE differences |
| Date: | 2004-10-26 23:39:46 |
| Message-ID: | 200410261639.46055.josh@agliodbs.com |
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| Lists: | pgsql-hackers |
Mark,
> The plans are different and I suspect thats where the differences lie.
> For brevity (and readability) I won't copy the plans here but I'll
> provide the links. Search for 'PERF1.POWER.Q2' in the file, it's the
> second query executed and you'll notice the differences under the
> SubPlan:
Yeah, the difference seems to be an arbitrary choice of which table to join on
first. The error is only +10 ms, but when it's being executed 3000
times ...
Will delve into this when I can re-format it, and try to figure out why the
planner is choosing what it is.
--
--Josh
Josh Berkus
Aglio Database Solutions
San Francisco
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