From: | Luca Ferrari <fluca1978(at)gmail(dot)com> |
---|---|
To: | pgsql-general <pgsql-general(at)lists(dot)postgresql(dot)org> |
Subject: | enable_seqscan to off -> initial cost 10000000000 |
Date: | 2021-04-23 15:39:16 |
Message-ID: | CAKoxK+6LA_w3u3hFeofw=SP6LSR0i6_Zh==GLWJ3y_nEhsRX5A@mail.gmail.com |
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Lists: | pgsql-general |
Hi all,
this could be trivial, but I would like an explaination: if I turn off
sequential scans on a table without indexes, the same access plan is
increased by a 10000000000 factor. I suspect this is a warning for me
to remind that something is misconfigured, or is there anothe reason?
testdb=# create table tseq( pk serial );
CREATE TABLE
testdb=# explain select * from tseq;
QUERY PLAN
--------------------------------------------------------
Seq Scan on tseq (cost=0.00..35.50 rows=2550 width=4)
(1 row)
testdb=# set enable_seqscan to off;
SET
testdb=# explain select * from tseq;
QUERY PLAN
---------------------------------------------------------------------------
Seq Scan on tseq (cost=10000000000.00..10000000035.50 rows=2550 width=4)
(1 row)
testdb=# show server_version;
server_version
----------------
12.5
Thanks,
Luca
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