Thanks for your reply, Marti, as I answered to Tom couple of days ago adjusting of 'effective_cache_size' to 80% of RAM and 'random_page_cost' from 2 to 1 helped me.
On 8 October 2014 00:26, Marti Raudsepp <marti@juffo.org> wrote:
On Fri, Oct 3, 2014 at 6:38 PM, Andrey Lizenko <lizenko79@gmail.com> wrote: > Is it possible to force optimizer choose the second plan without doing "set > enable_hashjoin = off;" ? > > Increasing of 'effective_cache_size' leads to similar thing with mergejoin, > other options (work_mem, shared_buffers. etc) do not change anything.
Have you tried changing random_page_cost?
In small databases where most of the data is cached anyway, lowering random_page_cost to somewhere between 1 and 2 usually leads to better planner decisions.
