On Tue, 2006-03-07 at 11:15, Alvaro Herrera wrote:
> Scott Marlowe wrote:
>
> > Lastly, I noticed that after you clusters on all your indexes, the query
> > planner switched from a merge join to a hash join, and it was slower.
> > You might wanna try turning off hash joins for a quick test to see if
> > merge joins are any faster.
>
> Anyway please note that clustering "all indexes" does not really make
> sense. You can cluster only on one index. If you cluster on another,
> then the first clustering will be lost. Better make sure to cluster on
> the one index where it makes the most difference.
Note that I was referring to his clustering on an index for each table.
I.e. not on every single index. but he clustered on four tables /
indexes at once, so that was what I was referring to. Sorry for any
confusion there.
So, do you see any obvious, low hanging fruit here?