
The IBM replication architecture consists of two main elements: the Capture program and the Apply program. The architecture is based on individual components that interoperate, letting you customize your data replication environment. The Capture program captures changes as they occur at the source and stores them in the change-data tables and unit-of-work tables (IBMSNAP_UOW, sometimes called the staging area). The Apply program reads the change-data tables and unit-of-work tables and applies these changes to targets, or copies data directly from the source (full-refresh mode).