Three-Tier Architecture in Ax ERP

The three tiers in this architecture are dedicated for the following three types of jobs:
  Client—The Presentation layer—This is where the forms are stored. Place client specific classes and methods here.
  Object server—The Business application logic layer—Transaction-oriented database update jobs should be run here, close to the database.
  Database server—The Database layer—Utilize the power of the database server by using aggregate functions, joins, and other calculating features of the database management system.