Postgres Pro
Downloads
Home   >   mailing lists

Re: MAX() and multi-column index on a partitioned table? - Mailing list pgsql-performance

From Tom Lane
Subject Re: MAX() and multi-column index on a partitioned table?
Date
Msg-id 21054.1432343630@sss.pgh.pa.us
Whole thread Raw
In response to Re: MAX() and multi-column index on a partitioned table?  (Dave Johansen <davejohansen@gmail.com>)
List pgsql-performance
Tree view 
Dave Johansen <davejohansen@gmail.com> writes:
> On Fri, May 22, 2015 at 3:42 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> What PG version are you using?  9.1 or newer should know how to do this
>> with a merge append of several indexscans.

> Sorry, I should have mentioned that in the original email. I'm using 8.4.20
> on RHEL 6. From your reply, it sounds like this is the expected behavior
> for 8.4 and 9.0. Is that the case?

Yeah, pre-9.1 is not very bright about that.  You could factor the query
manually, perhaps, though it's surely a pain in the neck.

            regards, tom lane

pgsql-performance by date:

Previous
From: Dave Johansen
Date:
Subject: Re: MAX() and multi-column index on a partitioned table?
Next
From: Tory M Blue
Date:
Subject: ERROR: missing chunk number 0 for toast value 1821556134 in pg_toast_17881