Session Affinity Policy

Web applications where a user session has back-to-back online transaction processing (OLTP) have

better performance when repeated operations against the same set of records are processed by the

same RAC instance. Business applications such as online shopping and online banking are typical

examples of this pattern.

A GridLink data source uses the Session Affinity policy to ensure all the data base operations for a

web session, including transactions, are directed to the same Oracle RAC instance of a RAC cluster.

Note:

The context is stored in the HTTP session. It is up to the application how windows (within a browser

or across browsers) are mapped to HTTP sessions.

Note 2:

* GridLink Affinity

WebLogic Server GridLink affinity policies are designed to improve application performance by

maximizing RAC cluster utilization. A GridLink data source monitors RAC load balancing advisories

(LBAs) using the AffEnabled attribute to determine if RAC affinity is enabled for a RAC cluster. The

first connection request is load balanced using Runtime Connection Load-Balancing (RCLB) and is

assigned an Affinity context. All subsequent connection requests are routed to the same Oracle RAC

instance using the Affinity context of the first connection until the session ends or the transaction

completes.

* Session Affinity

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Reference; Configuring and Managing JDBC Data Sources for Oracle Weblogic server 12c, Using

GridLink Data Sources