Date: Thu, 1 Aug 2013 23:19:15 -0400
From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Sergey Burladyan <eshkinkot@gmail.com>
Cc: Jeff Janes <jeff.janes@gmail.com>,
 "pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
Subject: Re: Looks like merge join planning time is too big, 55
 seconds
Message-ID: <20130802031914.GE5669@eldon.alvh.no-ip.org>
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Sergey Burladyan escribió:
> I also find this trace for other query:
> explain select * from xview.user_items_v v where ( v.item_id = 132358330 );
> 
> #0  0x00007ff766967620 in read () from /lib/libc.so.6
> #1  0x00007ff7689cfc25 in FileRead ()
> #2  0x00007ff7689ea2f6 in mdread ()
> #3  0x00007ff7689cc473 in ?? ()
> #4  0x00007ff7689ccf54 in ReadBufferExtended ()
> #5  0x00007ff7688050ca in index_fetch_heap ()
> #6  0x00007ff76880523e in index_getnext ()
> #7  0x00007ff768a63306 in ?? ()
> #8  0x00007ff768a67624 in ?? ()
> #9  0x00007ff768a67d9c in ?? ()
> #10 0x00007ff768a688fc in scalargtsel ()

It'd be useful to see what's in frames 7-9, but this might be related to
get_actual_variable_range().  I don't see anything else nearby that
would try to read portions of the table.

-- 
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services


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