Can a non-RAC database use SCAN ?

Question

I have a 4 node 11gR2 cluster which has all different kinds of versions ( 10g ,11gR1 & 11gR2 ) on both RAC & NON RAC .
I know for sure that I can use SCAN for non 11gR2 databases for RAC databases .
For standalone db's It seems like it is working intermitently but is this supported ? the reason why I ask is there is no documentation on how to configure or troubleshoot for non-RAC using SCAN .
Appreciate your help
Ravi

Answer 1

I was trying to find some information about the issue, but i think SCAN is really designed for RAC databases.
You don't really need to use the SCAN for what you just described:
you can update the client tnanames with the vip addresses of all nodes with FAILOVER = ON
Example:
(DESCRIPTION=
(ADDRESS_LIST=
(ADDRESS=(PROTOCOL=TCP)(HOST=node1-vip)(PORT=1521))
(ADDRESS=(PROTOCOL=TCP)(HOST=node2-vip)(PORT=1521))
(ADDRESS=(PROTOCOL=TCP)(HOST=node3-vip)(PORT=1521))
(ADDRESS=(PROTOCOL=TCP)(HOST=node4-vip)(PORT=1521))
(FAILOVER = ON)
(CONNECT_DATA=(SERVER = DEDICATED)(SERVICE_NAME=DB.WORLD))
However, you can try this (i never tried it, but i think it should work):
- See the document http://download.oracle.com/docs/cd/E11882_01/install.112/e10813/undrstnd.htm#BEICFAIC
+... If you do not set LOCAL_LISTENER, then the Database Agent automatically keeps the database associated with the Grid home's node listener updated...+
So don't set the LOCAL_LISTENER in your db.
- Update the client tnsnames with the SCAN if the version of the database is 11.2.0.1
- Try to see if it works fine
- Move your db to another node and try again