2017-09-12 14:01 GMT+02:00 Tom Lane <t...@sss.pgh.pa.us>: > "Frank Millman" <fr...@chagford.com> writes: > > Pavel Stehule wrote: > >> 2017-09-12 8:45 GMT+02:00 Frank Millman <fr...@chagford.com>: > >>> I am experimenting with optimising a SQL statement. One version uses > 4 LEFT JOIN’s and a 5-way CASE statement in the body. The second moves the > filtering into the JOIN section, and I end up with 16 LEFT JOIN’s and no > CASE statements. > > >> you can experimentally try increase FROM_COLLAPSE_LIMIT to some higher > number 14 maybe 16 > > > I tried increasing FROM_COLLAPSE_LIMIT, but it made no difference. > > For this you need to increase join_collapse_limit, not > from_collapse_limit. (Usually, though, there's little reason not to keep > them the same.) >
sure - my mistake - I though it. Thank you Pavel > > regards, tom lane > > > -- > Sent via pgsql-general mailing list (pgsql-general@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-general >
