Configuring Shared Memory 

Use

Session failover is a strategy frequently used to improve the robustness of application servers. The AS Java offers three kinds of media for session failover: database, file system and shared memory. Shared memory based failover provides the best performance of the three ones.

Within the AS Java, the SAP JVM provides an integrated shared session store, combining high performance, low contention and maximum compatibility for a wide range of applications.

●      You can configure Shared Memory via particular properties. They are represented as tables and you can see them, for example in the SAP MC.

●      This procedure enables you to change the number of the relevant tables’ rows. You can change number of the concurrently supported active Java applications, Java processes, threads, EJB sessions and so on.

If you change the properties of an instance, the changes will apply only to the selected instance.

Prerequisites

You have started and connected the Config Tool to a database.

More information: Connecting to a Database.

Procedure

       1.      From the tree structure select the instance you want to configure.

       2.      Choose View  → Expert Mode.

       3.      Choose Shared Memory.

       4.      From the table below, select the property you want to configure.

       5.      In the Custom property data field, enter the new custom value.

Avoid configuring properties on a template level.

       6.      Choose Set.

       7.      Choose  Apply Changes.

       8.      Restart the cluster.