Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock

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От
Simon Riggs
Тема
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock
Дата
Msg-id
1279185867.1735.7463.camel@ebony
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Дерево обсуждения
ALTER TABLE SET STATISTICS requires AccessExclusiveLock Peter Eisentraut <peter_e@gmx.net>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Tom Lane <tgl@sss.pgh.pa.us>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Alvaro Herrera <alvherre@commandprompt.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Alvaro Herrera <alvherre@commandprompt.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Bruce Momjian <bruce@momjian.us>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Peter Eisentraut <peter_e@gmx.net>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Bruce Momjian <bruce@momjian.us>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Cédric Villemain <cedric.villemain.debian@gmail.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Josh Berkus <josh@agliodbs.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Robert Haas <robertmhaas@gmail.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Peter Eisentraut <peter_e@gmx.net>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Andres Freund <andres@anarazel.de>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Andres Freund <andres@anarazel.de>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Andres Freund <andres@anarazel.de>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Andres Freund <andres@anarazel.de>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Andres Freund <andres@anarazel.de>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Tom Lane <tgl@sss.pgh.pa.us>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Andres Freund <andres@anarazel.de>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Robert Haas <robertmhaas@gmail.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Robert Haas <robertmhaas@gmail.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Tom Lane <tgl@sss.pgh.pa.us>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Robert Haas <robertmhaas@gmail.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Andres Freund <andres@anarazel.de>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Tom Lane <tgl@sss.pgh.pa.us>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Andres Freund <andres@anarazel.de>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Andres Freund <andres@anarazel.de>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Robert Haas <robertmhaas@gmail.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Robert Haas <robertmhaas@gmail.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Robert Haas <robertmhaas@gmail.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Simon Riggs <simon@2ndQuadrant.com>
Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock Bruce Momjian <bruce@momjian.us>
On Thu, 2010-07-08 at 07:16 +0100, Simon Riggs wrote:

> I'll take my previous patch through to completion now

Patch to reduce lock levels for 
 ALTER TABLE
 CREATE TRIGGER
 CREATE RULE

I've completely re-analyzed the required lock levels for sub-commands,
so lock levels can now also be these, if appropriate.
 ShareUpdateExclusiveLock - allows db reads and writes
 ShareRowExclusiveLock - allows db reads only

When ALTER TABLE is specified with multiple subcommands the highest lock
level required by any subcommand is applied to the whole combined
command.

The lock levels are in many ways different from both my own earlier
patch and much of the discussion on this thread, which I have taken to
be general comments rather than considered thought.

Nothing much speculative here, so will commit in a few days barring
objections.

-- 
 Simon Riggs           www.2ndQuadrant.com
 PostgreSQL Development, 24x7 Support, Training and Services
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