3. Distributed database design
The existence of RDBMSs, no matter how sophisticated, does not exempt the user (the data administrator) from designing the RDB, i.e. defining the structure of the database and the operations applicable to it. The design problem differs, however, depending on whether an RDB is created from scratch (top-down approach) or by aggregating existing databases (bottom-up approach).
3.1 Top-down approach
At the conceptual and external levels, the RDB is perceived as a centralized database; classic design processes for centralized databases therefore apply to the global external and global conceptual levels.
The difficulty therefore lies in the global internal level where, considering the RDB as a set of relations, we specify :
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Distributed database design
Query processing
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