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Re: creating CHECK constraints as NOT VALID

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "Alvaro Herrera" <alvherre(at)alvh(dot)no-ip(dot)org>, "Pg Hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: creating CHECK constraints as NOT VALID
Date: 2011-05-31 16:35:01
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Lists: pgsql-hackers
Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
> This patch allows you to initially declare a CHECK constraint as
> NOT VALID, similar to what we already allow for foreign keys. 
> That is, you create the constraint without scanning the table and
< after it is committed, it is enforced for new rows; later, all
> rows are checked by running ALTER TABLE VALIDATE CONSTRAINT, which
> doesn't need AccessExclusive thus allowing for better concurrency.
I think it's a valuable feature, not just in terms of timing and
concurrency, but in terms of someone starting with less-than-perfect
data who wants to prevent further degradation while cleaning up the
existing problems.  This feature is present in other databases I've

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Subject: Re: creating CHECK constraints as NOT VALID
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