Tuesday, February 21, 2012

SCAN Listener

Single Client Access Name (SCAN) is a New Oracle RAC 11g R2 feature that provides a single name for clients to access Oracle Databases running in a cluster.

The benefit is that the client's connect information does not need to change if you add or remove nodes in the cluster. It provides Load balancing and Faliover for client connections to the database.

SCAN can be configured using either DNS (Domain Name Service) or GNS (Grid Naming Service).

SCAN IP address must be on the same subnet as that of our public network in the cluster.

It uses single name which resolves multiple IPs, we can check the scan configuration in DNS using nslookup

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