On Thu, Jul 10, 2008 at 1:16 PM, Finn Jorgensen <finn.oracledba@xxxxxxxxx> wrote: > > Checking an AWR report I noticed that the "Av Rd(ms)" column of the > tablespace IO stat for that tablespace is at 671ms (Yikes!) when the > RMAN job is running and a much more normal 3.6ms when it's not. > > How many channels are being used? You may want to reduce the # of channels if > 1. You can use the 'SET LIMIT' command to slow down RMAN. (it's mostly undocumented) See "Making RMAN Perform' at http://jaredstill.com/articles.html There's a couple pages on RATE and SET LIMIT -- Jared Still Certifiable Oracle DBA and Part Time Perl Evangelist