Re: Hash Aggregate plan picked for very large table == out of memory

I should have mentioned this previously: running the same query against the
same data on 8.1.5 does not result in a hash aggregate plan or an out of
memory error. (Note: the hardware is different but very similar -- the main
difference is the 8.1.9 server (with the error) has faster disks)

On 6/14/07, Mason Hale <masonhale(at)gmail(dot)com> wrote:
>
> Thanks Tom. Here's more info:
>
> What have you got work_mem set to?
>
>
> 40960
>
> What's the actual number of groups
> > (target_page_id values)?
>
>
> Approximately 40 million (I'll have a more precise number when the query
> finishes running ).
>
> Maybe this helps?
>
> crystal=> select null_frac, n_distinct, correlation from pg_stats where
> tablename = 'page_page_link' and attname = 'target_page_id';
> null_frac | n_distinct | correlation
> -----------+------------+-------------
> 0 | 550017 | 0.240603
> (1 row)
>
> Mason
>
>
>