Re: out-of-order caution
Simon Riggs <simon@2ndquadrant.com>
From: Simon Riggs <simon@2ndQuadrant.com>
To: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2011-10-27T15:55:07Z
Lists: pgsql-hackers
On Thu, Oct 27, 2011 at 4:41 PM, Kevin Grittner <Kevin.Grittner@wicourts.gov> wrote: > On the docs page for the SELECT statement, there is a caution which > starts with: > > | It is possible for a SELECT command using ORDER BY and FOR > | UPDATE/SHARE to return rows out of order. This is because ORDER BY > | is applied first. > > Is this risk limited to queries running in READ COMMITTED > transactions? If so, I think that should be mentioned in the > caution. I think it should say that if this occurs with SERIALIZED transactions it will result in a serialisation error. Just to say there is no effect in serializable mode wouldn't be helpful. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services