On 6/19/2015 10:47 AM, Andreas Kretschmer wrote:
Explain Analyze outputs (links as requested):
Default plan: http://explain.depesz.com/s/ib3k
Forced index (random_page_cost=1.0): http://explain.depesz.com/s/lYaP
Software/Hardware: PGSql 9.2.1, Windows 8.1, 8GB RAM
All pgsql settings are at their defaults.
increase work_mem. per session via set work_mem = 'xxxMB'; or in
postgresql.conf, reload.
Hi Andreas,
The number of rows in the events table isn't constrained, so
unfortunately it isn't feasible to set work_mem high enough to allow an
in-memory sort. Forcing the planner to use the index works to produce a
fast query, so I'm wondering if there is a more general way to getting
the planner to take into account that work_mem isn't big enough to fit
the query which will result in a MUCH more costly external merge.
Thanks,
-Ian
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