Advances in Databases and Information Systems: 18th East by Yannis Manolopoulos, Goce Trajcevski, Margita Kon-Popovska

By Yannis Manolopoulos, Goce Trajcevski, Margita Kon-Popovska

This e-book constitutes the completely refereed court cases of the 18th East eu convention on Advances in Databases and data platforms, ADBIS 2014, held in Ohrid, Macedonia, in September 2014. The 26 revised complete papers provided including one invited speak have been rigorously chosen and reviewed from eighty two submissions. The papers are equipped in topical sections on information versions and question languages; information warehousing; question and data-flow optimization; details extraction and integration; spatial, temporal and streaming information; info mining and data discovery; information association and actual concerns; and knowledge and enterprise processes.

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Extra info for Advances in Databases and Information Systems: 18th East European Conference, ADBIS 2014, Ohrid, Macedonia, September 7-10, 2014. Proceedings

Example text

The mapping is simple and easy to implement. 34 H. Voigt and W. Lehner The downside is that it may lead to a large number of potentially small physical tables (at worst 2E tables where E is the number of entity domains in a database) and tuples need to be physically moved if their domain membership is changed. , with a bitmap, directly in a tuple itself. This gives liberty regarding the assignment of tuples to physical tables, up to using a single (universal) table for all tuples. With many tuples having the same domain membership, it comes to the price of storage overhead – negligible in most cases, though.

This can be achieved with constraints of the form (A, tech-type(A, fθ (A)), P ) for A ∈ fσ (R) and R ∈ R. 5 Implementation Consideration The FRDM data model is positioned as a flexible descendant of the relational model. Therefore it is suitable to be implemented within the existing and established relational database system architecture. In this section, we briefly discuss how this can be done. The characteristics of FRDM require four main changes to existing relational database system code. First, plan operators and query processing have to be adapted to handling descriptive relations.

Lemma 2. If G is a schema foundation graph, then there exists a regular expression RE so that G (RE) = G and L (RE) = T (G) and [RE] = Lab (G). 5 Relational Algebra for Regular XRelation Definition 5 (Regular XRelation for Regular Expressions). Let RE be a regular expression and let G be a schemagraph for RE, moreover, let w = (IN, v1 , . . , vn , OU T ) ∈ T (G) be a traversal on G. Let domU ; U ∈ [RE] be sets of data values, then {(v1 : a1 , . . , vn : an ) |ai ∈ domvi } is a tuple of type w.

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