Re: Analyze on table creation?

Hi

po 26. 6. 2023 v 19:41 odesílatel James Coleman <jtc331(at)gmail(dot)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
>
>
>