By Kazimierz Subieta, Jacek Plodzien (auth.), Janis Barzdins, Albertas Caplinskas (eds.)
Modern info platforms range in essence from their predecessors. They help operations at a number of destinations and assorted time zones, are allotted and network-based, and use multidimensional facts research, info warehousing, wisdom discovery, wisdom administration, cellular computing, and different glossy info processing tools.
This ebook considers primary problems with smooth info platforms. It discusses question processing, info caliber, facts mining, wisdom administration, cellular computing, software program engineering for info structures building, and different themes. The booklet offers study effects that aren't to be had in different places. With greater than forty participants, it's a good resource of data in regards to the state-of-the-art within the box of databases and knowledge platforms. it really is meant for researchers, complicated scholars, and practitioners who're considering the improvement of complex info systems.
Read or Download Databases and Information Systems: Fourth International Baltic Workshop, Baltic DB&IS 2000 Vilnius, Lithuania, May 1–5, 2000 Selected Papers PDF
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Extra info for Databases and Information Systems: Fourth International Baltic Workshop, Baltic DB&IS 2000 Vilnius, Lithuania, May 1–5, 2000 Selected Papers
On demand propagation needs some additional structures containing among others the information about: changes made to base objects, already performed propagation, and propagation that need to be performed. The propagation of changes from base to view objects requires look-ups to Class and Object Mapping Structures. Accessing them and searching for the information consume additional time, slowing down the propagation process. However, indexing techniques will be used to reduce the time of searching for information.
Different variations of the structure has been already presented before ([6, 7, 8, 9]). Here we make a concise overview of the structure, pointing out those features of the structure that is of significance for the rest of the presentation. The main contribution of this paper is Section 4, where we propose and analyse different bitmap structures for indexing on sets, and Section 5, where we make a comprehensive comparison of different index structures in the context of indexing on sets. 2. Indexing on Sets Assume that we have a questionnaire for persons that apply for a job.
Analogously, the expected number of index accesses required to perform an is-superset predicate is equal to the expected number of supersets of a randomly selected subset of v