From: | James Coleman <jtc331(at)gmail(dot)com> |
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To: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Analyze on table creation? |
Date: | 2023-06-26 17:40:49 |
Message-ID: | CAAaqYe97qEUwt14C3HRkOhuC1g=DK-B-pij8HGwFaovQMvp1aw@mail.gmail.com |
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Lists: | pgsql-hackers |
Hello,
Have we ever discussed running an analyze immediately after creating a table?
Consider the following:
create table stats(i int, t text not null);
explain select * from stats;
Seq Scan on stats (cost=0.00..22.70 rows=1270 width=36
analyze stats;
explain select * from stats;
Seq Scan on stats (cost=0.00..0.00 rows=1 width=36)
Combined with rapidly increasing error margin on row estimates when
adding joins means that a query joining to a bunch of empty tables
when a database first starts up can result in some pretty wild plan
costs.
This feels like a simple idea to me, and so I assume people have
considered it before. If so, I'd like to understand why the conclusion
was not to do it, or, alternatively if it's a lack of tuits.
Regards,
James Coleman
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