Scan listener for single instance

Question

Hi,
in my 6 node 11.2 cluster, i've 1 single instance 11.2
This instance uses GI listener and i can be accessed using host vip.
Using the scan i get ora-12514.
Why?
Thanks.

Answer 1

Hi,
"SCAN listeners can run on any node in the cluster. SCANs provide location independence for
databases so that the client configuration does not have to depend on which nodes run a
particular database.
Oracle Database 11g Release 2 and later instances register with SCAN listeners only as
remote listeners. Upgraded databases register with SCAN listeners as remote listeners, and
also continue to register with all other listeners."
"When a client submits a connection request, the SCAN listener listening on a SCAN IP
address and the SCAN port are contacted on the client’s behalf. Because all services on the
cluster are registered with the SCAN listener, the SCAN listener replies with the address of
the local listener on the least-loaded node where the service is currently being offered.
Finally, the client establishes a connection to the service through the listener on the node
where service is offered. All these actions take place transparently to the client without any
explicit configuration required in the client."
So scan redirect to the vip in which the instance is running.
Edited by: Mr.D. on 22-mag-2013 1.39