I'll second the book recommendation. It's a great book and the best I've seen on the subject. Chris ________________________________ From: kyle Hailey <kylelf@xxxxxxxxx> To: bdbafh@xxxxxxxxx Cc: shastry17@xxxxxxxxx; oracle-l <oracle-l@xxxxxxxxxxxxx> Sent: Tue, 5 October, 2010 5:03:13 Subject: Re: Books or links on Oracle Wait events (in depth) I'll second what Paul said and if you still want to learn about the waits, I've put up a bunch of non-RAC wait documentation at https://sites.google.com/site/embtdbo/wait-event-documentation The only decent book I'm aware of is The Oracle Wait Interface, see on Amazon http://tinyurl.com/2ck8nc4 The Oracle documentation itself has gotten better over the years Best Wishes Kyle Hailey http://db-optimizer.blogspot.com/ >