Yes, absolutely, we have one customer who has an 8 node RAC cluster that's running 12 databases, each with between 2 and 8 instances, and a pile of other customers with 2-4 node clusters with multiple databases. I'm sure there's some internal limitations as to the number of services that can be registered in the CRS, but I doubt many people run into it. Thanks, Matt -- Matthew Zito Chief Scientist GridApp Systems P: 646-452-4090 mzito@xxxxxxxxxxx http://www.gridapp.com -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx on behalf of Bob Sent: Tue 11/11/2008 9:12 PM To: oracle-l Subject: multiple databases in a single RAC cluster Hi, As much as Ive been browsing / studying rac... Im looking for a definitive answers about how many "databases" can be on one rac cluster. Say I want to have 4 independent databases on one cluster, is that possible? I understand one can easily have multiple instances pointing to a single database (sga, control_file, db_name, spfile, archive_dest, etc) but what about several independent databses? Any documents referencing this? I found this on ask tom... just wanted to confirm with this group, probably in a more concise manner. http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:529123700346381713 So, How many databases (sga, control_file, db_name, spfile, archive_dest, etc) can be in a single rac cluster? thanks Bob -- //www.freelists.org/webpage/oracle-l