Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> However, you'd have to be spending a lot of time chasing through
> long HOT chains before that would happen enough to make this a
That makes it all the more mysterious, then. These tables are
insert-only except for a weekly delete of one week of the oldest
data. The parent table, with the date, is deleted first, then this
table deletes "where not exists" a corresponding parent. I can't
see how we'd ever have a HOT chain in these tables.
Is there anything in particular you'd like me to check?
In response to
pgsql-performance by date
|Next:||From: Tom Lane||Date: 2010-11-09 23:29:40|
|Subject: Re: Huge overestimation in rows expected results in bad plan |
|Previous:||From: Tom Lane||Date: 2010-11-09 23:17:42|
|Subject: Re: anti-join chosen even when slower than old plan |