Re: planner row-estimates for tsvector seems horribly wrong

From: Jan Urbański <wulczer(at)wulczer(dot)org>
To: Sushant Sinha <sushant354(at)gmail(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: planner row-estimates for tsvector seems horribly wrong
Date: 2010-10-24 12:57:47
Message-ID: 4CC42D4B.7020307@wulczer.org
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On 24/10/10 14:44, Sushant Sinha wrote:
> I am using gin index on a tsvector and doing basic search. I see the
> row-estimate of the planner to be horribly wrong. It is returning
> row-estimate as 4843 for all queries whether it matches zero rows, a
> medium number of rows (88,000) or a large number of rows (726,000).
>
> The table has roughly a million docs.
>
> I see a similar problem reported here but thought it was fixed in 9.0
> which I am running.

Hi,

what's your default statistics target? Could you attach the output of

select * from pg_stats where tablename = '<the-tablename>';

and

select typanalyze from pg_type where typname = 'tsvector';

Thanks,
Jan

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