Download Advanced Database Systems by Narain Gehani, H. V. Jagadish, O. Shmueli (auth.), Nabil R. PDF

By Narain Gehani, H. V. Jagadish, O. Shmueli (auth.), Nabil R. Adam, Bharat K. Bhargava (eds.)

Database administration is attracting extensive curiosity in either educational and business contexts. New program components similar to CAD/CAM, geographic details structures, and multimedia are rising. the desires of those software components are way more complicated than these of traditional enterprise purposes. the aim of this ebook is to collect a suite of present study concerns that addresses a huge spectrum of themes concerning database platforms and functions. The ebook is split into 4 elements: - object-oriented databases, - temporal/historical database structures, - question processing in database platforms, - heterogeneity, interoperability, open approach architectures, multimedia database systems.

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On the basis of the implication relationship two structures are defined: an authorization object schema (AOS), defining the implication links between object types, and an authorization object lattice (A OL), defining the relationships between the instances of the authorization objects. An AOL is therefore an instance of an AOS for a given system. Every authorization object in the AOL is an instance of only one object type indicated in the AOS. 4, respectively. On the basis of the AOL, a partially ordered relationship (>) exists among all objects: Given two objects oi and oj, oi > oj if an impfication link exists directed from oi to oj in the authorization object lattich; oi > oi if oi = oi or oi > oj or there exist objects o l , o 2 , .

For example, suppose to have an class Employee storing information about the employees and a function "Salary", defined on it, returning the salary. Thought some employees can be authorized to read the salary of everybody, some employees could be restricted to see their own salary. This condition can easily be enforced by defining a derived function "Self_Salary" which takes into consideration the caller of the function and calls function "Salary" to return the user's salary. Since users cannot be authorized to call directly function "Salary", the authorization to be specified on function "Self_Salary" is a static one.

In this context, negative authorization may give rise to conflicts in the authorization of implicit authorizations. Therefore, care must be taken that authorization conflicts will not arise. For example, the positive authorization to read a composite and the negative authorization to read one of its component cannot be present at the same time, unless the authorization on the component is a weak authorization and can therefore be overwritten. As in the case of inheritance hierarchy conflicts are avoided by accepting insertion of a new authorization only in case it does not conflict with authorizations already specified.

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