Rac instance display in sql

Question

Hi all expert,
We are in 2008R2 windows with Rac 4 instance running in two nodes. When i do sql plus and connect to SQL it shows the screen like below
sys@X>
eventhough it connected to either X1 in node 1 or X2 in node 2  instance in X database instance. I want to display below
if i connect like connect sys@X as sysdba and if the oracle rac  point to either X1 or X2 instance righty away after that  then it should
sys@X1 if it is connected to X1 and sys@X2 if it is connected to X2.

Answer 1

I can do this via the login.sql:
column instance_name new_value instnc_name;
select sys_context('userenv', 'instance_name') AS instance_name from dual;
column instance_name clear
set sqlprompt "_USER'@'instnc_name> "
The challenge doing this is that SET SQLPROMPT uses substitution variables, not SQL functions  SET System Variable Summary, so the script above has to run the SQL to retrieve the value, and the value will only change when this script runs again. Putting it in login.sql means it gets run every time you log in or do a CONNECT command in SQLPlus.