Re: insane index scan times

Sergei Shelukhin escribió:

> explain select * from entries inner join stuff on entries.id =
> stuff.id;
>
> -> Seq Scan on stuff (cost=0.00..193344.00 rows=12550400 width=12)
>
>
> set enable_seqscan = off;
>
> explain select * from entries inner join stuff on entries.id =
> stuff.id;
>
> -> Index Scan using blah on stuff (cost=0.00..25406232.30
> rows=12550400 width=12)
>
> Query execution resuls are consistent w/explain. wtf? no I mean,
> WTF?????!!!!!!!!!!!!!!!!!!!
>
> Sorry. But I 'm amazed.

I am not. You are asking it to give you 12 million rows -- so it does.
What's the surprise if it takes long?

Do you really want to have all 12 million rows as a result?

--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.