On Wed, Jan 3, 2018 at 5:22 PM, Thuc Nguyen Canh <thucnguyencanh@xxxxxxxxx> wrote: > Here is the query plan of a query that causes above issue for any > random_page_cost < 3 (I keep the work_mem by default) > > 'Sort (cost=9441498.11..9542397.83 rows=40359886 width=64) (actual > time=33586.588..33586.590 rows=4 loops=1)' I guess that must be EXPLAIN ANALYZE, because it includes "actual" time, so it must be the plan when you set random_page_code >= 3, right? Otherwise it would raise the error. Can you now set it to < 3 and do just EXPLAIN (no ANALYZE) so that we can see the failing plan without trying to run it? I'm guessing it's different, because the plan you showed doesn't look like it would want 50MB of DSM. -- Thomas Munro http://www.enterprisedb.com
