Download e-book for iPad: Advanced Database Systems by Narain Gehani, H. V. Jagadish, O. Shmueli (auth.), Nabil R.

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

ISBN-10: 3540575073

ISBN-13: 9783540575078

Database administration is attracting large curiosity in either educational and business contexts. New program components comparable to CAD/CAM, geographic details structures, and multimedia are rising. the desires of those program parts are way more complicated than these of traditional enterprise functions. the aim of this e-book is to assemble a suite of present study concerns that addresses a extensive spectrum of themes on the topic of database platforms and functions. The publication is split into 4 components: - object-oriented databases, - temporal/historical database platforms, - question processing in database platforms, - heterogeneity, interoperability, open method architectures, multimedia database systems.

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N i l = { G}. The authorization to create objects cannot be propagated among objects related in the AOL. Implicit and Explicit Authorizations The ORION authorization model allows the derivation of new authorizations from those specified by the users. , the authorization to write an object implies the authorization to read the object), as expressed in the respective lattices. 30 C H A P T E R 2. ACCESS CONTROLS IN O 0 DATABASE S Y S T E M S Authorizations specified by users are called explicit, whereas authorizations derived by the system are called implicit.

This approach works well with the composite object approach. For example, consider objects ol and 02, such that o2 is a component of ol. If object o~ (a component of object ol) is removed, the next time a message is send from object ol to object 02, object ol will be notified that the referenced object does not exist. The above approach has been refined in two directions. The first, called upward cascading delete, is similar to the approach proposed by Jajodia and Sandhu [292] for the delete operations in the multilevel relational secure model.

Therefore, in the message filter model security is achieved through checking message exchanges among objects. T h e basic idea of the approach is that information flow control can be achieved by mediating the flow of messages among objects. Indeed, in object-oriented systems all information flows are through message exchanges. This approach is very simple, in t h a t it requires the security mechanism to deal only with two elements: objects and messages. It is based on two basic principles governing message exchanges among objects in the system 1.

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Advanced Database Systems by Narain Gehani, H. V. Jagadish, O. Shmueli (auth.), Nabil R. Adam, Bharat K. Bhargava (eds.)

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