By Narain Gehani, H. V. Jagadish, O. Shmueli (auth.), Nabil R. Adam, Bharat K. Bhargava (eds.)
Database administration is attracting huge curiosity in either educational and commercial contexts. New software components equivalent to CAD/CAM, geographic info platforms, and multimedia are rising. the wishes of those program parts are way more complicated than these of traditional enterprise functions. the aim of this ebook is to assemble a collection of present learn matters that addresses a vast spectrum of issues relating to database platforms and purposes. The e-book 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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Additional resources for Advanced Database Systems
Conflicts are handled by rejecting insertion of new authorizations when it conflicts with some other authorization already present in the system. To allow authorizations for generating subclasses, the access mode subclass-generate (SG) is added to the set of access modes. If a user is authorized for the SG access mode on some class, the user can define subclasses on it. , it is not propagated in the AOL. Moreover, the following relationships hold: W > SG > RD. Given these relationships, authorization along the specialization hierarchy can be derived according to the rules given in the previous section.
The model distinguishes between two types of references among objects: general, and composite. The latter is used to model the fact that a referenced object is actually a part of (or a component of) a given object. An object and all its components constitute a composite object. Composite references axe further refined into shared/exclusive and dependent/independent. A shared composite reference allows the referenced object to be shared among several composite objects, while an exclusive composite reference constrains an object to be component of at most one composite object at a time.
In systems belonging to the second category, an explicit delete operation is not av~dlable to the users. Systems with explicit delete operations allow an object to be deleted even if there are references to it. If a message is sent to a deleted object, the system returns a notification to the invoker object. Therefore, the invoker object must be ready to deal with the exception arising from a dangling reference. This approach is used by the ORION system, and it is also suggested by Zdonik .