On Mon, Dec 12, 2005 at 10:23:42AM -0300, Alvaro Herrera wrote: > Michael Fuhr wrote: > > The cost depends on your usage patterns. I did tests with one of > > my applications and saw no significant performance difference for > > simple selects, but a series of insert/update/delete operations ran > > about 30% slower when block- and row-level statistics were enabled > > versus when the statistics collector was disabled. > > This series of i/u/d operations ran with no sleep in between, right? > I wouldn't expect a normal OLTP operation to be like this. (If it is > you have a serious shortage of hardware ...)
There's no sleeping but there is some client-side processing between groups of i/u/d operations. As I mentioned in another message, the application reads a chunk of data from a stream, does a few i/u/d operations to update the database, and repeats several thousand times. The hardware is old but it's adequate for this application. What kind of overhead would you expect? -- Michael Fuhr ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
