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A description of a database design method according to user views is introduced. The database schema is decomposed by applying the operators: horizontal decomposition, vertical decomposition and derived horizontal decomposition. Resulting fragments (= effects of the decomposition) are controlled...
Many computer systems today have evolved into hybrids of assorted subsystems. This assortment can include systems of disparate technologies(batch, data base ...), hardware configurations and of different chronological ages.As managers try to 'forge' these hybrids into homogeneous, integrated...
Changes in the user population continues the trend to more simplicity for the user and increased sophistication of the computer systems. In addition, advances in data storage technology have enforced the growth and creation of incomplete data files. A growing number of users require information...
In this paper, a method for concurrency control in distributed DBMSs, called Permission Test Method is proposed. The PT method satisfies the basic requirements for concurrency control, that is, it executes the transactions in a serializable order, deadlocks do not appear and indefinite...
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