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Design problem of distributed systems: Making decisions about the placement of data and programs across the sites of a computer network as well as possibly designing the network itself.• In DDBMS, the distribution of applications involves– Distribution of the DDBMS software– Distribution of applications that run on the database• Distribution of applications will not be considered in the following; instead the distributionof data is studied.Dimension for the analysis of distributed systems– Level of sharing: no sharing, data sharing, data + program sharing– Behavior of access patterns: static, dynamic– Level of knowledge on access pattern behavior: no information, partial information,complete information