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From: Robert Voinea <robert.voinea@topex.ro>
Organization: Topex
To: pgsql-admin@postgresql.org
X-ASG-Orig-Subj: Re: [ADMIN] How to add constraints without validating data.
Subject: Re: How to add constraints without validating data.
Date: Fri, 28 May 2010 08:44:52 +0300
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	=?utf-8?q?I=C3=B1igo_Martinez_Lasala?= <imartinez@vectorsf.com>,
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Why don't you use a partition?

Create another table that inherits from the table and add your new constrai=
nts=20
to the new table.


On Thursday 27 May 2010 19:32:33 Nilesh Govindarajan wrote:
> On Thu, May 27, 2010 at 9:49 PM, I=C3=B1igo Martinez Lasala
>=20
> <imartinez@vectorsf.com> wrote:
> > Constraints are special triggers, but triggers anyway.
> >=20
> > So, If you truncate the table, create the contraint and then restore wi=
th
> > triggers disabled, it could be faster that create the contraint and wait
> > until it checks all table data... or not... :)
> >=20
> > How would disabling triggers help that ? He just wants to add
> > constraints without loss of data. I don't think he has any triggers.
>=20
> I agree constraints are triggers. But as far as I know, truncating
> table doesn't disable the constraints.
> Its same as deleteing all rows and then altering the table.
> In that manner, even my solution would be appropriate because it
> creates a duplicate table with the constraints.
> Whatever be the method, I don't think its possible to avoid the
> constraints. Correct me if I'm wrong.

=2D-=20
Robert Voinea <robert (dot) voinea (at) topex (dot) ro>
Software Developer
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