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Re: plan time of MASSIVE partitioning ...

From: PostgreSQL - Hans-Jürgen Schönig <postgres(at)cybertec(dot)at>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: plan time of MASSIVE partitioning ...
Date: 2010-09-03 14:46:26
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Lists: pgsql-hackers
On Sep 3, 2010, at 4:40 PM, Tom Lane wrote:

> =?iso-8859-1?Q?PostgreSQL_-_Hans-J=FCrgen_Sch=F6nig?= <postgres(at)cybertec(dot)at> writes:
>> imagine a system with, say, 1000 partitions (heavily indexed) or so. the time taken by the planner is already fairly heavy in this case.
> As the fine manual points out, the current scheme for managing
> partitioned tables isn't intended to scale past a few dozen partitions.
> I think we'll be able to do better when we have an explicit
> representation of partitioning, since then the planner won't
> have to expend large amounts of effort reverse-engineering knowledge
> about how an inheritance tree is partitioned.  Before that happens,
> it's not really worth the trouble to worry about such cases.
> 			regards, tom lane

thank you ... - the manual is clear here but we wanted to see if there is some reasonably low hanging fruit to get around this.
it is no solution but at least a clear statement ...

	many thanks,


Cybertec Schönig & Schönig GmbH
Gröhrmühlgasse 26
A-2700 Wiener Neustadt, Austria

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