Implementation Guide › Performance Tuning › Data Tier Performance › User Store Capacity Planning › How to Estimate a Sustained User Directory Search Rate › Use Authorization Guidelines to Estimate Directory Searches › Case 1: Policy Membership and User Directory Requests

Case 1: Policy Membership and User Directory Requests

A company has enabled three policies protect their portal application:

• Policy A requires one user directory request to determine SiteMinder policy membership.
• Policies B may require up to two user directory requests to determine SiteMinder policy membership.
• Policies C may require up to three user directory requests to determine SiteMinder policy membership.

Additionally, the results of a capacity planning effort show that the application has an authorization load of 726,000.

The company uses the following formula to begin estimating the number of requests that the Policy Server sends to the user directory to service the authorization load:

authorization_load x percent_of_policies * number_of_searches = daily_authorization_requests

• authorization_load

  Specifies the number of daily authorizations for the application.

• percent_of_policies

  Specifies the number of enabled policies, represented as a percentage, that may result in the same number of user directory requests to determine SiteMinder policy membership.

  Note: The total percentage must equal 100 percent.

• number_of_searches

  Specifies the number of user directory requests that the Policy Server may make to determine SiteMinder policy membership.

• daily_authorization_requests

  Specifies the number of user directory requests to service the authorization request.

Result:

• Policy A—792,000 * 0.33 * 1= 261,360 requests
• Policies B and C—792,000 * 0.66 * 2= 1,045,440 requests
• Total user directory requests-158,000 + 1,045,440= 1,306,880 requests

The company uses this estimate to determine the total number of user directory requests required to service the daily authorization load.