Hi tom,
sorry for my bad.
My production server is 7.3.7, but the development is 7.3.1 and I ran the
tests on 7.3.1.

It is courios that on 7.3.1 the query is not constantly bad.
>From time to time it is running well.

Tom Lane wrote:

> pginfo <[EMAIL PROTECTED]> writes:
> > I am using pg 7.3.3 on RH 7.3,
> Are you certain the server is 7.3.3?  This looks like a mergejoin
> estimation bug that was present in 7.3 and 7.3.1, but should be fixed
> in 7.3.2 and later.
> If it is 7.3.3, I'd like to see the pg_stats rows for
> a_acc.ids_vid_doc and a_vid_doc.ids.
>                         regards, tom lane
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