On Thu, Jan 11, 2007 at 12:10:34AM -0300, Alvaro Herrera wrote: > Jim C. Nasby wrote: > > > > Is the best way to do that usually to lower the scale factors? Is it > > > ever a good approach to lower the scale factor to zero and just set the > > > thresholds to a pure number of rows? (when setting it for a specific > > > table) > > > > The problem is what happens if autovac goes off and starts vacuuming > > some large table? While that's going on your queue table is sitting > > there bloating. If you have a separate cronjob to handle the queue > > table, it'll stay small, especially in 8.2. > > You mean "at least in 8.2". In previous releases, you could vacuum > that queue table until you were blue on the face, but it would achieve > nothing because it would consider that the dead tuples were visible to a > running transaction: that running the vacuum on the large table. This > is an annoyance that was fixed in 8.2. True, but in many environments there are other transactions that run long enough that additional vacuums while a long vacuum was running would still help. -- Jim Nasby jim@xxxxxxxxx EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)
