Re: PostgreSQL does not choose my indexes well

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>
Cc: Stephen Frost <sfrost(at)snowman(dot)net>, Thomas Kellerer <shammat(at)gmx(dot)net>, "pgsql-performance(at)lists(dot)postgresql(dot)org" <pgsql-performance(at)lists(dot)postgresql(dot)org>
Subject: Re: PostgreSQL does not choose my indexes well
Date: 2020-04-23 20:45:42
Message-ID: 12521.1587674742@sss.pgh.pa.us
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"David G. Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> writes:
> I noticed that too...I suspect its related to the ANALYZE result:

> Index Scan using idx_tabla_entidad on entidad (cost=0.56..51121.41
> rows=1405216 width=20) (actual time=0.037..242.609 rows=1409985 loops=1)
> Index Cond: ((cod_tabla)::bigint = 4)

Yeah, that *strongly* suggests that cod_tabla isn't really bigint.
I'm wondering about domains, for instance.

regards, tom lane

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