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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 vast curiosity in either educational and business contexts. New program components resembling CAD/CAM, geographic details platforms, and multimedia are rising. the wishes of those software components are way more complicated than these of traditional company functions. the aim of this publication is to assemble a suite of present learn matters that addresses a wide spectrum of issues with regards to database platforms and functions. The ebook is split into 4 components: - object-oriented databases, - temporal/historical database structures, - question processing in database platforms, - heterogeneity, interoperability, open method architectures, multimedia database systems.

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Extra resources for Advanced Database Systems

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The implication relationship among strong authorizations is denoted by --~. The implication relationship between weak authorizations is denoted by ~--~. down, a m E A : Sk > 8l~Oi > o j , a n >_ am (s. down, am G A : Sk ~ SllOi > o j , a n ~_ am Rule 5 Vsl,sk 6 S,o{,oj 6 0 , an E A , a m E A . , ~a~) ~ (s~. nil, a,~ E A : (sk, o . ~am) -~ (s. down are propagated]or subjects at higher levels, and ]or objects and access modes at lower levels as described in the corresponding lattices (Rule 1). Since every subject, object, and access mode is > and <_ itself, this rule allows the derivation of, from an authorization, authorizations involving the same or different subject, object, and access mode.

4. DISCRETIONARY ACCESS CONTROL 33 second approach, a user wishing to derive a class from another class would not have any privacy on the instances of the subclass (which are readable by the creator of the superclass). Therefore, users could be discouraged from reusing existing classes not taking advantage of the characteristic of inheritance. When multiple inheritance is allowed, implicit authorizations along the class hierarchy may give rise to conflicts. Conflicts are handled by rejecting insertion of new authorizations when it conflicts with some other authorization already present in the system.

DISCRETIONARY ACCESS CONTROL 35 In object-oriented databases, where objects are accessed through methods, which can be nested, implementation of content-dependent condition is not straightforward. A possible solution would be incorporating conditions in the method. This approach has the drawback of having method specification to be dependent on authorizations, therefore a change in the authorizations would require to change specification of methods. A further aspect that must be taken into consideration when considering contentdependent authorization is that since satisfaction of the conditions in the authorizations depends on the values of the objects' attributes and can therefore change over the time is more difficult to ensure the consistency and completeness of the authorizations.

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