From: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
---|---|
To: | Allen <dba(at)girders(dot)org> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: out of memory for query result |
Date: | 2005-10-22 20:10:15 |
Message-ID: | 20051022201015.GG16589@svana.org |
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Thread: | |
Lists: | pgsql-general |
On Sat, Oct 22, 2005 at 03:46:18PM -0400, Allen wrote:
> I am trying to select a result set from a 2-table join, which should be
> returning 5,045,358 rows. I receive this error:
>
> DBD::Pg::st execute failed: out of memory for query result
AFAIK, DBD:Pg never uses a cursor unless you ask it to. So you probably
want to code a loop like:
DECLARE CURSOR blah AS ...
while( FETCH 1000 )
{
process rows...
}
If you don't use a cursor in the backend, then DBI will try to pull the
*entire* result and store it in memory, which is why you don't have
enough...
Hope this helps,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.
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