Re: Foreign key wierdness

Didier Moens <Didier(dot)Moens(at)dmb001(dot)rug(dot)ac(dot)be> writes:
> I did some extensive testing using PostgreSQL 7.3.1 (logs and results
> available upon request), and the massive slowdown is NOT related to
> qualified tablename syntax or (lack of) VACUUM ANALYZE, but to the
> following change :

> pgAdminII 1.4.2 :
> -------------------
> CREATE TABLE articles (
> article_id integer DEFAULT
> nextval('"articles_article_id_key"'::text) NOT NULL,
> ...

> pgAdminII 1.4.12 :
> --------------------
> CREATE TABLE articles (
> article_id bigint DEFAULT nextval('"articles_article_id_key"'::text)
> NOT NULL,
> ...

Ah-hah, and I'll bet that the column being linked to this one by the
foreign key constraint is still an integer?

> With two tables each containing some 20.000 entries, the fk creation
> time between both of them increases from ~ 1.8 secs to ~ 221 secs.

Seems odd that the cost would get *that* much worse. Maybe we need to
look at whether the FK checking queries need to include explicit casts
...

regards, tom lane