By Narain Gehani, H. V. Jagadish, O. Shmueli (auth.), Nabil R. Adam, Bharat K. Bhargava (eds.)
Database administration is attracting broad curiosity in either educational and business contexts. New program parts akin to CAD/CAM, geographic info platforms, and multimedia are rising. the wishes of those program parts are way more advanced than these of traditional company functions. the aim of this booklet is to assemble a collection of present study matters that addresses a vast spectrum of themes regarding database platforms and purposes. The e-book is split into 4 elements: - object-oriented databases, - temporal/historical database platforms, - question processing in database platforms, - heterogeneity, interoperability, open procedure architectures, multimedia database systems.
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Extra resources for Advanced Database Systems
ACCESS CONTROLS IN O0 DATABASE SYSTEMS then be used to derive new authorizations. For example, a read authorization an a generic instance of an object implies the same authorization on all the versions of the object; a write authorization on the set of versions of an object imphes the same authorization on the versions described by the generic instance. The write authorization on the set of versions of an object is also the authorization to create a new version from a working version of the instance.
In p a r t i c u l a r , if d u r i n g t h e e x e c u t i o n of a m e t h o d m a n o t h e r m e t h o d m j is invoked, t h e i n v o c a t i o n is allowed if e i t h e r m ~ is public for end-users a n d t h e user h a s t h e a u t h o r i z a t i o n for it or m ~ is p r i v a t e for end-users a n d m belongs to t h e i n v o c a t i o n scope of m ~. T h e m o d e l allows users to g r a n t o t h e r users a u t h o r i z a t i o n s to execute m e t h o d s . A user c a n g r a n t such a u t h o r i z a t i o n s on an o b j e c t if t h e user is t h e c r e a t o r or one of t h e owners of t h e object.
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 , . . 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.
Advanced Database Systems by Narain Gehani, H. V. Jagadish, O. Shmueli (auth.), Nabil R. Adam, Bharat K. Bhargava (eds.)