The method server is the only Windchill process that communicates directly with the database. In this sense, Windchill runtime is a classic three-tier architecture. Using a shared database login, the method server maintains multiple database connections assigned to worker threads as needed to carry out individual transactions.

The interface to the database is implemented by a Persistent Object Manager (POM) layer within the server that acts to abstract the actual database interface from the business logic.

For more information about persistence see the customization information located in the Basic Customization and Advanced Customization areas of the Windchill Help Center.