Implementation Guide › Performance Tuning › Application Tier Performance › Authorization Guidelines › User Authorization Cache › Estimate the Size of the User Authorization Cache

Estimate the Size of the User Authorization Cache

The default size of the user authorization cache is 10 MB. You can estimate the amount of space the user authorization cache requires and use the Policy Server Management Console to adjust the default size.

To estimate the size of the user authorization cache

1. Use the following formula to estimate the number of cache entries:

   expected_users * number_of_policies_per_session = entries

   • expected_users

     Specifies the total number of users authenticating to the applications SiteMinder is protecting.

   • number_of_policies_per_session

     Specifies the average number of SiteMinder policies that apply to a user during the session.

     Note: Each SiteMinder policy has the potential to enter a unique entry into the user authorization cache.

   • entries

     Specifies the number of cache entries authorizations can create.

2. Use the following formula to estimate the size of the cache:

   (entries * .000062) + 1

   Note: .000062 represents the approximate size of a cache entry in MB.