From: | Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com> |
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To: | Jan Kesten <jan(dot)kesten(at)web(dot)de> |
Cc: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: index not used again |
Date: | 2006-04-02 19:46:55 |
Message-ID: | 20060402124047.X46838@megazone.bigpanda.com |
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Lists: | pgsql-performance |
On Sun, 2 Apr 2006, Jan Kesten wrote:
> Stephan Szabo schrieb:
>
> > Did you reset the table contents between these two (remember that
> > explain analyze actually runs the query)? The second appears to be
> > changing no rows from the output.
>
> I for myself did not, but as there are runnig automatic jobs
> periodically I can't tell, if one ran in the time while I was testing
> (but I guess not). At starting my tests all rows contained a zero for
> all tokens and there should be no ones at all.
The reason I asked is that the explain analyze output for the first query
on fak6 (using a seqscan) seemed to imply 24k rows actually matched the
condition and were updated, so comparisons to the later times may be
skewed.
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