Thanks a lot.
On Sun, Nov 30, 2008 at 11:28 PM, Tom Lane
<tgl@sss.pgh.pa.us> wrote:
"David Rowley" <
dgrowley@gmail.com> writes:
> I assume workmem, effective_cache_size and random_page_cost are all the same
> in the 2 postgresql.conf?
between the two plans seems to be that the first one is using a
"hashed subplan" and the second one isn't. Assuming the same datatypes in both databases, the only reason not to use a hashed subplan is if the hashtable is estimated not to fit in work_mem.
I changed work_mem in test machine to be implemented in production server later. Completely forgot that when faced with this issue. Sorry for the trouble.
I learnt about "hashed subplan" requiring sufficient work_mem, however.
Thanks and regards,
Ma Sivakumar
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