Re: Analyze on table creation?
От | Pavel Stehule |
---|---|
Тема | Re: Analyze on table creation? |
Дата | |
Msg-id | CAFj8pRBVh2XErtOdrf+J+bEs-_ffOBOFiz4pFe-gbA95zrdi=A@mail.gmail.com обсуждение исходный текст |
Ответ на | Analyze on table creation? (James Coleman <jtc331@gmail.com>) |
Ответы |
Re: Analyze on table creation?
|
Список | pgsql-hackers |
Hi
po 26. 6. 2023 v 19:41 odesílatel James Coleman <jtc331@gmail.com> napsal:
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.
I like this. On the second hand, described behaviour is designed for ensuring of back compatibility.
Regards
Pavel
Regards,
James Coleman
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