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Re: pg11: Query using index, but only for half the partitions

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Subject: Re: pg11: Query using index, but only for half the partitions
From: Andreas Kretschmer <andreas@xxxxxxxxxxxxxxx>
Date: Thu, 23 Apr 2020 12:47:28 +0200
Cc: pgsql-general@xxxxxxxxxxxxxxxxxxxx
In-reply-to: <CAP50yQ9=KfZn2Hfi0iVj5zUoeAk8Ub=6aTW6_xrFQyV-3oG02Q@mail.gmail.com>
References: <CAP50yQ-oh31n95FvDOP4mcPc6n_cTTmRBHx0hyiXJ27oPzHjHA@mail.gmail.com> <83a2b0ef-1376-1873-3524-a824cb69f7f2@a-kretschmer.de> <CAP50yQ9=KfZn2Hfi0iVj5zUoeAk8Ub=6aTW6_xrFQyV-3oG02Q@mail.gmail.com>
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Am 23.04.20 um 12:30 schrieb Stefan Knecht:

There's no question that this is more expensive than just reading the95 rows from the index directly and returning them


not sure, you can play with

enable_seqscan = off

and compare the costs. What is the setting for random_page_cost ?


Regards, Andreas


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2ndQuadrant - The PostgreSQL Support Company.
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