| 摘要 |
The present subject matter relates to data access and, more particularly, to data unification models. Some embodiments provide systems, software, and methods of handling data access requests for data items having values stored in multiple instances across one or more data sources. Some embodiments provide a data manager to service access requests for a data item, wherein the data manager services the data access requests for the data item with data from an authoritative instance or from one of one or more secondary instances. In some embodiments, the data manager services the request for the data item according to a data model. The data model, in some embodiments, exists in metadata that is accessible to the data manager.
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