From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
---|---|
To: | Ron <ronljohnsonjr(at)gmail(dot)com> |
Cc: | pgsql-general(at)lists(dot)postgresql(dot)org |
Subject: | Re: ALTER TABLE .. SET STATISTICS |
Date: | 2018-08-05 14:43:29 |
Message-ID: | 20180805144329.kjctch4yb42j37i4@alvherre.pgsql |
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Thread: | |
Lists: | pgsql-general |
On 2018-Aug-05, Ron wrote:
> For columns of type bytea which store image data (PDFs, JPGs, etc) would it
> speed up the ANALYZE process to SET STATISTICS = 0?
Yes. I'd suggest also looking at ALTER TABLE ... SET STORAGE to avoid
having Postgres try to compress those columns, which is useless waste of
CPU cycles, since those formats already compress.
> That way, default_statistics_target could be cranked higher -- giving better
> statistics for needed columns -- without polluting pg_statistics with
> unneeded data?
Right.
With the default being 100 I don't think there's a real need to crank it
higher server-wide, but it may be useful to crank it higher for specific
columns.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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