12.3 Components of a Distributed Database System (DDBS)

A DDBS normally has the software components illustrated in FIGURE 12.5. Note that some sites contain all of these components, while others might not.

An illustration of the components of a Distributed Database system. The network consists of three sites 1, 2, and 3. Sites 1 and 3 are connected to D D B S, L D B M S, and D C. D D B M S is connected to the global data dictionary. L D B M S is connected to the local database. Site 2 is connected to D D B M S and D C. D D B M S is connected to the global data dictionary.

FIGURE 12.5 Components of a DDBS

  • Data communications (DC) component. The DC component is the software at each node that links it to the network. This DC component includes a complete description of the network’s nodes and lines. For each node, it identifies processing performed, storage capacity, processing power, and current state. For each link, it identifies the nodes it connects, type of link, bandwidth, protocols required, and the current ...

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