Databases

Databases and Information Systems: Fourth International by Kazimierz Subieta, Jacek Plodzien (auth.), Janis Barzdins,

By Kazimierz Subieta, Jacek Plodzien (auth.), Janis Barzdins, Albertas Caplinskas (eds.)

Modern details platforms fluctuate in essence from their predecessors. They aid operations at a number of destinations and diverse time zones, are disbursed and network-based, and use multidimensional facts research, information warehousing, wisdom discovery, wisdom administration, cellular computing, and different sleek info processing equipment.
This booklet considers basic problems with sleek info structures. It discusses question processing, information caliber, information mining, wisdom administration, cellular computing, software program engineering for info platforms development, and different issues. The e-book offers examine effects that aren't to be had in different places. With greater than forty members, it's a strong resource of data in regards to the cutting-edge within the box of databases and data structures. it's meant for researchers, complex scholars, and practitioners who're thinking about the improvement of complex details systems.

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Additional resources for Databases and Information Systems: Fourth International Baltic Workshop, Baltic DB&IS 2000 Vilnius, Lithuania, May 1–5, 2000 Selected Papers

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Furthermore, view materialisation in MutliView results in the materialisation of pointers to base objects, whereas in our approach new objects are created as the instances of view classes. For this reason, the approach to object-oriented views that we developed is more suitable for application in distributed systems and in data warehousing systems. Our approach is similar to the one used in [8] as both allow to define a view as a separate schema of an arbitrary complex structure and behaviour. However, our approach considers also the maintenance of materialised views which is not the case of [8].

The first one (oid;Ci of type OlD) is the identifier of an updated base object, the second one (C; of type string) is the name of the base class whose instance was updated, and the third one (attributes of type set of string) is the set of attributes of C; whose values were updated. This set can be empty in case when a base object is created or deleted. Propagate_Updates (oidiCi: OID, ci : string, attributes : set of string) VOij : OID; Vi : string; vsi : string; ai : string; prop_upd : boolean; if created then II II II II II II II variable holding view object identifier variable holding view class name variable holding view schema name variable holding attribute name flag indicating whether update propagation is required if a new base object was created 26 R.

When a composite view object is created from oid1 it has to be composed of v0id11 because oid1 is originally composed of oidn, from which in tum vOidn was created. To find the mapping between oid11 and vOidu the appropriate Object Mapping Structure is examined by the function OMS_Get_ View _Object. view objects ................. t ................................. •I• ........... base objects 1 1 oid 1 • --+ aggregation relationship . . oid 11 - - Ill> derivation relationship Figure 3. Mappings between base and view composite objects Example 7.

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