If you deploy a session store, all Policy Servers in the environment must use the same session store database.
Deploying a master session store is a way to achieve session store redundancy. A master session store lets each Policy Server communicate with the closest replicated version. This method of communication:
Note: For more information about configuring replication, see your vendorspecific documentation. For more information about configuring session store failover, see the Policy Server Administration Guide.
The following diagram illustrates all Policy Servers sharing a common view into a session store.
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