Tom Lane wrote: > Alvaro Herrera <[EMAIL PROTECTED]> writes: > > If we apply Heikki's idea of advancing OldestXmin, I think what we > > should do is grab the value from pgstats when vacuum starts, and each > > time we're going to advance OldestXmin, grab the value from pgstats > > again; accumulate the differences from the various pgstat grabs. At the > > end we send the accumulated differences as the new dead tuple count. > > Considering that each of those values will be up to half a second old, > I can hardly think that this will accomplish anything except to > introduce a great deal of noise ...
Normally, yes, but the values can be older if the vacuum_cost_delay is large. -- Alvaro Herrera http://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc. ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
