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.)

Database administration is attracting large curiosity in either educational and business contexts. New software parts corresponding to CAD/CAM, geographic details structures, and multimedia are rising. the wishes of those software components are way more complicated than these of traditional enterprise functions. the aim of this publication is to collect a suite of present learn matters that addresses a vast spectrum of subject matters concerning database structures and functions. The ebook is split into 4 components: - object-oriented databases, - temporal/historical database structures, - question processing in database structures, - heterogeneity, interoperability, open approach architectures, multimedia database systems.

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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. Beside this classification, two other orthogonM classifications are introduced.

On the basis of the implication relationship, and therefore of the role lattice, a partially ordered relationship (>) is defined on all subjects as follows: Given two subjects s~ and s j, s~ > sj if an impfication rink exists directed from si to sj in the role lattice; si > sj if s~ = sj or si :> s 3 or there exist subjects sl, s ~ , . , sn such that si > sl > 82 > ... > sn > sj. 2, we have Super_user > Chief_accountant > Accountant > Employee. Objects The ORION authorization model considers the following objects as objects to be protected: databases, classes in the database, instances of classes and their components (attributes, values, and methods).

O n such t h a t oi > ol > o2 > ... > on > oj. Access modes T h e m o d e l considers the following access modes: 9 Write ( W ) to write to an object. 9 Write_Any ( W A ) it is analogous to the Write access mode. It allows writes to an II The nodes shown in italics correspond to authorization objects representing a set of objects of the next lower level. 4. D I S C R E T I O N A R Y A C C E S S C O N T R O L 27 System l Database Class 1 Set@instances Instance Seto]-Attribute- Values 1 Attribute-Value F i g u r e 2,3: A n e x a m p l e of an a u t h o r i z a t i o n o b j e c t s c h e m a object.

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