Message-Id: <1168460880.7578.1168617399@webmail.messagingengine.com>
From: "Jeremy Haile" <jhaile@fastmail.fm>
To: pgsql-performance@postgresql.org
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	<20070110202006.GU12217@nasby.net>
Subject: Re: Partitioning
In-Reply-To: <20070110202006.GU12217@nasby.net>
Date: Wed, 10 Jan 2007 15:28:00 -0500

I really wish that PostgreSQL supported a "nice" partitioning syntax
like MySQL has.  

Here is an example:
CREATE TABLE tr (id INT, name VARCHAR(50), purchased DATE)
  PARTITION BY RANGE( YEAR(purchased) ) (
  PARTITION p0 VALUES LESS THAN (1990),
  PARTITION p1 VALUES LESS THAN (1995),
  PARTITION p2 VALUES LESS THAN (2000),
  PARTITION p3 VALUES LESS THAN (2005)
);

And to drop a partition:
ALTER TABLE tr DROP PARTITION p2;


This seems so much more intuitive and simpler than what is required to
set it up in PostgreSQL.  Does PostgreSQL's approach to table
partitioning have any advantage over MySQL?  Is a "nicer" syntax planned
for Postgres?


On Wed, 10 Jan 2007 14:20:06 -0600, "Jim C. Nasby" <jim@nasby.net> said:
> BTW, someone coming up with a set of functions to handle partitioning
> for the general 'partition by time' case would make a GREAT project on
> pgFoundry.
> 
> On Fri, Jan 05, 2007 at 12:47:08PM +0100, Mikael Carneholm wrote:
> > Take a look at the set of partitioning functions I wrote shortly after
> > the 8.1 release:
> > 
> > http://www.studenter.hb.se/~arch/files/part_functions.sql
> > 
> > You could probably work something out using those functions (as-is, or
> > as inspiration) together with pgAgent
> > (http://www.pgadmin.org/docs/1.4/pgagent.html)
> > 
> > /Mikael
> > 
> > > -----Original Message-----
> > > From: pgsql-performance-owner@postgresql.org
> > [mailto:pgsql-performance-
> > > owner@postgresql.org] On Behalf Of Arnau
> > > Sent: den 5 januari 2007 12:02
> > > To: pgsql-performance@postgresql.org
> > > Subject: [PERFORM] Partitioning
> > > 
> > > Hi all,
> > > 
> > >    I'm not sure if this question fits in the topic of this list.
> > > 
> > >    I'm interested in partitioning and it's the first time I'd use it.
> > > There is an issue I don't know how you handle it. Lets say I'm
> > > interested in store monthly based statistical data like the example of
> > > http://www.postgresql.org/docs/8.2/static/ddl-partitioning.html. What
> > I
> > > don't like of this approach is that the monthly tables, rules... must
> > be
> > > created "manually" or at least I haven't found any other option.
> > > 
> > >    My question is how do you manage this? do you have a cron task that
> > > creates automatically these monthly elements (tables, rules, ... ) or
> > > there is another approach that doesn't require external things like
> > cron
> > >   only PostgreSQL.
> > > --
> > > Arnau
> > > 
> > > ---------------------------(end of
> > broadcast)---------------------------
> > > TIP 5: don't forget to increase your free space map settings
> > 
> > 
> > ---------------------------(end of broadcast)---------------------------
> > TIP 9: In versions below 8.0, the planner will ignore your desire to
> >        choose an index scan if your joining column's datatypes do not
> >        match
> > 
> 
> -- 
> Jim Nasby                                            jim@nasby.net
> EnterpriseDB      http://enterprisedb.com      512.569.9461 (cell)
> 
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