From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
---|---|
To: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Reducing some DDL Locks to ShareLock |
Date: | 2008-10-07 12:56:23 |
Message-ID: | 1223384183.4747.160.camel@ebony.2ndQuadrant |
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Thread: | |
Lists: | pgsql-hackers |
On Tue, 2008-10-07 at 08:30 -0400, Andrew Dunstan wrote:
> Simon Riggs wrote:
> >
> > My main focus is on these commands
> > * CREATE TRIGGER
> > * ALTER TABLE .. ADD PRIMARY KEY
> > * ALTER TABLE .. ADD FOREIGN KEY
> >
> > because those are the most painful ones. We could make it work against
> > more, but we'd need to rewrite lots and lots of catalog update code.
> Anything that scans the table is a prime candidate. In particular, for
> parallel pg_dump, ALTER TABLE ... ADD UNIQUE is important, as well as
> possibly other table constraints.
Yes, I should have mentioned: today's patch (v5) does ADD UNIQUE also.
I tested a concurrent mix of ALTER PK, FK and CREATE INDEX, all fine.
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support
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