Adam Tauno Williams escribió: > > > > I don't think such a document already exists, even rtfm_please doesn't > > > > know > > > > about any as of now. > > > The reason there isn't one is it doesn't need one; it's an > > > implementation detail not a user-visible feature. > > One reason to think it needs to be explained is that it affects how you > > plan for VACUUM. In tables where HOT is in charge of a large part of > > cleanup, you need to do a lot less vacuuming than you were for 8.2. In > > that sense it is very much user-visible. > > Wouldn't the thresholds in the auto-vaccuming make that adjustment > transparent?
For people that use autovacuum, yes, it would, but not everybody does. -- Alvaro Herrera http://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
