join problems: FATAL 1: palloc failure: memory exhausted
От | Oleg Bartunov |
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Тема | join problems: FATAL 1: palloc failure: memory exhausted |
Дата | |
Msg-id | Pine.GSO.3.96.SK.980731032232.28062B-100000@ra обсуждение исходный текст |
Ответы |
Re: [HACKERS] join problems: FATAL 1: palloc failure: memory exhausted
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Список | pgsql-hackers |
Hi, Below is an example of my query, which returns no plan and produces FATAL 1: palloc failure: memory exhausted while postgres 'eats' almost 113 Mb of RAM. This happens with pgsql 6.3.2+patches plus latest Vadim's one on Linux 2.0.35 libc5. Sorry for variable names :-) I remember discussion prior 6.3.2 about optimization of join and tried various -f options but this doesn't helps. When I run postmaster in debug mode I noticed some complains about geqo config file doesn't exists but not sure if this important. When I tried explain with less joins I got very bad plans with no indices used. Tables are not big - about 1000 records - just a classificators (2 columns) and only work_flats has 31 columns. Most columns have int2, int4 types. So database looks very simple and I didn't expect any problem. Of course there are a bunch of indices and I did vacuum before query. Currently I have to run a bunch of queries and do joins by hand (using perl) :-( Does development version 6.4 has some improvements ? I tried latest snapshot but couldn't run because of problem with initdb and missing anonymous cvs account. Regards, Oleg flats=> \i test.sql explain select a.ROOMS, b.STATION, a.STREET, a.HOUSE_NO, a.FLAT_NO, float8(a.PRICE)/1000.0, a.DO_METRO, c.SPOSOB_SH, a.FLOOR, e.HOUSE_TYPE_SHORT, a.HOUSE_FLOORS, float8(a.ALL_SQR)/100.0, float8(a.LIVE_SQR)/100.0, float8(a.KITCHEN)/100.0, f.SANUZEL_SHORT, a.SANUZEL_NO, a.BALKON, a.LODZHIA, a.HAVE_PHONE, a.HAVE_LIFT, a.HAVE_MUSOR, g.POL_SHORT, h.SOST_SHORT, i.STATUS_SHORT, a.COMMENT from WORK_FLATS a, METRO_STATIONS b, SPOSOB c, SERIALS d, HOUSE_TYPE e, SANUZELS f, POLS g, SOSTS h, STATUS i where b.STATION_ID = a.METRO_ID and c.SPOSOB_ID = a.DO_METRO_ID and a.SERIAL_ID = d.SERIAL_ID and d.HOUSE_TYPE_ID = e.HOUSE_TYPE_ID and f.SANUZEL_ID = a.SANUZEL and g.POL_ID = a.POL_ID and h.SOST_ID = a.SOST_ID and i.STATUS_ID = a.STATUS_ID and a.rooms = 1; FATAL 1: palloc failure: memory exhausted _____________________________________________________________ Oleg Bartunov, sci.researcher, hostmaster of AstroNet, Sternberg Astronomical Institute, Moscow University (Russia) Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/ phone: +007(095)939-16-83, +007(095)939-23-83
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