What functionality do you expect in a DDBMS?
What will be an ideal response?
Expect the same functionality of a centralized DBMS plus:
? extended communications services to provide access to remote sites and allow transfer of
queries and data among the sites using a network;
? extended system catalog to store data distribution details;
? distributed query processing, including query optimization and remote data access;
? extended security control to maintain appropriate authorization/access privileges to the
distributed data;
? extended concurrency control to maintain consistency of replicated data;
? extended recovery services to take account of failures of individual sites and the failures of
communication links.
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Fill in the blank(s) with the appropriate word(s).