Postgres Pro
Downloads
Home   >   mailing lists

Re: Large arrays give long lag on server side before command executes - Mailing list pgsql-general

From Tom Lane
Subject Re: Large arrays give long lag on server side before command executes
Date
Msg-id 7016.1096069371@sss.pgh.pa.us
Whole thread Raw
In response to Re: Large arrays give long lag on server side before command executes  (Steve Crawford <scrawford@pinpointresearch.com>)
Responses Re: Large arrays give long lag on server side before command executes  (David Helgason <david@uti.is>)
List pgsql-general
Tree view 
Steve Crawford <scrawford@pinpointresearch.com> writes:
> On Friday 24 September 2004 7:32 am, Tom Lane wrote:
>> I'm betting on some O(N^2) behavior in the array code, but it'll be
>> difficult to pinpoint without profile results.

> Possibly the bug we discussed early last year (IIRC added to todo but
> not fixed):
> http://archives.postgresql.org/pgsql-performance/2003-01/msg00235.php

No, it's not the same --- David sent me some results off-list and it
seems ReadArrayStr is the culprit.  I'm not completely sure why yet.

FWIW, the printtup part of your gripe is fixed in CVS tip.

            regards, tom lane

pgsql-general by date:

Previous
From: Steve Crawford
Date:
Subject: Re: Large arrays give long lag on server side before command executes
Next
From: Michael Fuhr
Date:
Subject: cvs update: waiting for anoncvs's lock