What does the Web Session Affinity feature of Active GridLink for RAC provide?
A.
It mandates that HTTP sessions must be stored in an Oracle RAC database for the highest
throughput and availability.
B.
It pins a connection to the thread associated with a web session such that subsequent
connection reservations are significantly faster.
C.
It stores a reference to the connection associated with an HTTP session in the session object.
D.
It allows developers to modify how their web application reserves and releases database
connections to allow enhanced performance.
E.
It provides improved performance by associating a database connection with an HTTP session.
Explanation:
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 AffinityReference; Configuring and Managing JDBC Data Sources for Oracle Weblogic server 12c, Using
GridLink Data Sources
E