According to the documentation for 10r2 (data guard concepts and administration, section 2.3.1 )the primary and standby must be have the same OS, but they could be of different releases. /johan On Tue, 2005-12-06 at 15:41 -0500, Luc Demanche wrote: > Hi, > > Our sysadmin wants to upgrade our Windows Server to 2003. > One of them in running our Standby database and the Primary database > is still on Windows 2000. > > Do you thing it's a problem having our Primary database on Windows > 2000 and the Standby database on Windows 2003 ? > > thanks > Luc > > -- > Luc Demanche > Oracle DBA > (514) 867-9977 -- //www.freelists.org/webpage/oracle-l