Siebel Master Data Applications Reference for Industry Applications > Architecture and Framework > About Siebel Master Data Applications Architecture >
Siebel Universal Customer Master Data Objects Layer
The Data Objects layer for Siebel Master Data Applications separates other layers from the database and is used only for data storage. It has native SQL and fully dynamic SQL generation. The data layer allows run-time switching between databases, for example, from local to server or testing to production. It auto-adapts to object manager and user interface requirements, and requires zero downtime for major release schema upgrades.
Siebel Master Data Applications support leading databases (DB2 UDB for Windows and UNIX, DB2 UDB for OS/390 and z/OS; Oracle; Microsoft SQL Server) on various platforms. The data layer can scale vertically (with size of server) and horizontally with database parallelization. For further information about the Data Objects layer, see Configuring Siebel Business Applications.