On 07/02/2013 8:09 AM, Howard Latham wrote: > I'm on V10 Oracle .on Redhat Linux and slightly perplexed > I have installed the 11 software and a test database via the installer but > after setting the path and explicity calling the right sqlplus I get cannot > mount db in exclusive mode. Quick verification - you used a new ORACLE_HOME for the 11gR2 software? And then shut down the 10g instance? -- //www.freelists.org/webpage/oracle-l