Database Directions: From Relational to Distributed, by James Larson

By James Larson

With out moving into the main points and complexities of particular advertisement items, this publication introduces database administration thoughts that transcend present day relational database administration structures - for example, dispensed, textual, multi-media and object-oriented. It covers dispensed database administration structures, the hazards linked to them, and replacement recommendations to the foremost pitfalls and technical difficulties; considers 3 sorts of textual dependent platforms info retrieval, hoovering and filtering - and describes numerous techniques to disbursed textual database administration platforms; explores DBMSs that deal with a number of new media varieties, and the specified difficulties brought by means of multimedia; and describes the elemental ideas of object-oriented info and the categories of DBMS that deal with them.

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Extra info for Database Directions: From Relational to Distributed, Multimedia and Object-Oriented Database Systems

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The static descriptions form the static model of the system. This model contains formal descriptions of class interfaces, their grouping into clusters as well as client and inheritance relations between them, showing the system structure. The dynamic descriptions, on the other hand, make up the system’s dynamic model. This model specifies system events, what object types are responsible for the creation of other objects, and system execution scenarios representing selected types of system usage with diagrams showing object message passing.

With the standard interpretation of the logical connectives, the precondition would not be fully specified since the expression can_marry (sweetheart) is not defined for void arguments. Therefore, some care must be taken when BON assertions are translated to implementation languages. For example, in Eiffel and then and or else have to be used, while in C++ the corresponding operators already have semi-strict semantics. A language-specific case tool could allow individual expressions to be marked as strict (in case they can be evaluated in any order), to allow for optimized assertion checking.

Typed interface descriptions A class interface consists of the syntax and semantics of its operations. The syntactic part of an operation, often called its signature, consists of its name, the number and types of its arguments (if any) and the type of its return value (if any). There are two basic policies with regard to types—static typing and dynamic typing. Static typing means that the user must specify the types of all operation signatures (along with the types of all local variables used) in the class text.

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