Am Wed, Feb 03, 2021 at 01:43:14AM -0500 schrieb Cherio:
> I just ran a few practical tests on large (~14mil rows) tables that have
> multiple indexes.
>
> SELECT COUNT(id) forces PostgreSQL to use the primary key index.
> SELECT COUNT(*) allows PostgreSQL to chose an index to use and it seems to
> be choosing one of smaller size which leads to less IO and hence returns
> the result faster.
Would you mind throwing in a test for
select count(1) ...
?
Karsten
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