I'm performing rolling upgrade of cpu patch at rac environment
I open a connection to the database (using service) and it connects to the first node. Then I shutdown the first node to perform an upgrade and check the connection, but it doesn't switch to the second node automatically, but returns TNS error. What about if it's a production database and there're a lot of online scripts running on that node?
However, I tried it again and it automatically switched wihout any error. What can be reason?
Agreed... use the -local option and do each node individually.
11gR2? If you have TNS issues, it is indicative of an improperly configured local/remote_listener or SCAN on one or more nodes. Sometimes when additional nodes are added, these parameters may not necessarily be correct.