Temat: relational model - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Realization of a system of efficient querying of hierarchical data transformed into a quasi-relational model
Autorzy:: Furmanek, A.
Tokaj, J.
Marcjan, R.
Siwik, L.
Powiązania:: https://bibliotekanauki.pl/articles/305395.pdf
Data publikacji:: 2016
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: XML
SQL
hierarchical data
relational model
Opis:: Extensible Markup Language was mainly designed to easily represent documents; however, it has evolved and is now widely used for the representation of arbitrary data structures. There are many Application Programming Interfaces (APIs) to aid software developers with processing XML data. There are also many languages for querying and transforming XML, such as XPath or XQuery, which are widely used in this field. However, because of the great flexibility of XML documents, there are no unified data storing and processing standards, tools, or systems. On the other hand, a relational model is still the most-commonly and widely used standard for storing and querying data. Many Database Management Systems consist of components for loading and transforming hierarchical data. DB2 pureXML or Oracle SQLX are some of the most-recognized examples. Unfortunately, all of them require knowledge of additional tools, standards, and languages dedicated to accessing hierarchical data (for example, XPath or XQuery). Transforming XML documents into a (quasi)relational model and then querying (transformed) documents with SQL or SQL–like queries would significantly simplify the development of data-oriented systems and applications. In this paper, an implementation of the SQLxD query system is proposed. The XML documents are converted into a quasi-relational model (preserving their hierarchical structure), and the SQL–like language based on SQL-92 allows for efficient data querying.
Źródło:: Computer Science; 2016, 17 (3); 353-369
1508-2806
2300-7036
Pojawia się w:: Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Model for dynamic and hierarchical data repository in relational database
Autorzy:: Piech, M.
Fracz, W.
Turek, W.
Kisiel-Dorohinicki, M.
Dajda, J.
Byrski, A.
Powiązania:: https://bibliotekanauki.pl/articles/305565.pdf
Data publikacji:: 2018
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: JSON
relational databases
EAV
CQRS
PostgreSQL
open schema model
Opis:: The aim of this research is to build an open schema model for a digital sources repository in a relational database. This required us to develop a few advanced techniques. One of them was to keep and maintain a hierarchical data structure pushed into the repository. A second was to create constraints on any hierarchical level that allows for the enforcement of data integrity and consistency. The created solution is mainly based on a JSON file as a native column type, which was designed for holding open schema documents. In this paper, we present a model for any repository that uses hierarchical dynamic data. Additionally, we include a structure for normalizing the input and description for the data in order to keep all of the model assumptions. We compared our solution with a well-known open schema model – Entity-Attribute-Value – in the scope of saving data and querying about relationships and contents from the structure. The results show that we achieved improvements in both the performance and disk space usage, as we extended our model with a few new features that the previous model does not include. The techniques developed in this research can be applied in every domain where hierarchical dynamic data is required, as demonstrated by the digital book repository that we have presented.
Źródło:: Computer Science; 2018, 19 (4); 479-500
1508-2806
2300-7036
Pojawia się w:: Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Parallel and distributed calculations supported and managed by the relational database
Równoległe i rozproszone obliczenia wspierane i zarządzane za pomocą relacyjnej bazy danych
Autorzy:: Oramus, P.
Powiązania:: https://bibliotekanauki.pl/articles/305595.pdf
Data publikacji:: 2009
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: obliczenia równoległe
relacyjna baza danych
model master/slave
parallel calculations
relational database
master/slave model
Opis:: A simple, based on a relational database, system, for a management of a parallel and a distributed computer calculations, is presented. In the proposed system, the parallel calculations are carried out according to a master/slave model. Because an input and an output data of programs are stored directly in the database, the use of files is reduced to a minimum. The management system allows for a combination of computing power of many computers for solving a single numerical problem.
W pracy prezentowany jest prosty, oparty o relacyjną bazę danych, system, przeznaczony do zarządzania równoległymi i rozposzonymi obliczeniami komputerowymi. W proponowanym systemie, obliczenia równoległe prowadzone są zgodnie z modelem master/slave. Ponieważ zarówno dane wejściowe, jak i wyjściowe programów zapisywane są bezpośrednio w bazie danych, użycie plików zostało ograniczone do minimum. System zarządzania pozwala na połączenie mocy obliczeniowej wielu komputerów w celu rozwiązania pojedynczego problemu numerycznego.
Źródło:: Computer Science; 2009, 10; 75-84
1508-2806
2300-7036
Pojawia się w:: Computer Science
Dostawca treści:: Biblioteka Nauki

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