Browsing by Subject "indexing"

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Access status: Restricted ,
Analiza wydajności baz danych MS SQL opartych o indeksowanie kolumnowe oraz technologię in-memory
(Data obrony: 2017-01-19) Chmielewski, Maciej
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Open Access ,
Integracja oraz indeksowanie rozproszonych zasobów danych w technologii »data grid«
(Wydawnictwa AGH, 2009) Kuliberda, Kamil; Kowalski, Tomasz Marek; Wiślicki, Jacek; Adamus, Radosław; Meina, Michał
The problems of integration of distributed resources are currently one of the most substantial issues in the domain of collecting data and retrieving consistent and reliable information - the answer has been included in the following paper. Authors describe aspects of transparent integration of distributed data into an object-oriented data grid with application of the p2p technology and introducing extremely crucial issues of indexing. The presented solution has been implemented and verified in the completely functional prototype. The paper presents basics of application of the p2p architecture and procedures of indexing data originating from remote sources. These procedures accelerate data access by orders of magnitude and data transportation becomes limited to the necessary minimum.
Access status: Open Access ,
Metody optymalizacji przez indeksowanie dla obiektowego języka zapytań
(Wydawnictwa AGH, 2009) Kowalski, Tomasz Marek; Cebula, Paweł; Kuliberda, Kamil; Wiślicki, Jacek; Adamus, Radosław
In paper we present an overview of query optimization by indexing for SBQL (Stack-Based Query Language). Developed methods have been implemented and tested in ODRA prototype system. The ODRA index implementation is based on linear hashing and works in a scope of a standalone database. It consists of transparent optimization, automatic index updating and management facilities. The semantic equivalence of proposed query optimization methods in the context of object data model and query language is discussed on several examples.
Access status: Open Access ,
Semantic text indexing
(Wydawnictwa AGH, 2014) Kaleta, Zbigniew
The following article presents a specific issue of semantic analysis of texts in natural language – text indexing and describes one field of its application (web browsing). The main part of this article describes a computer system assigning a set of semantic indexes (similar to keywords) to a particular text. The indexing algorithm employs a semantic dictionary to find specific words in a text that represent a text content. Furthermore, it compares two given sets of semantic indexes to determine similarities between texts (assigning a numerical value). The article describes the semantic dictionary – a tool essential to accomplish this task and its usefulness, the main concepts of the algorithm, and the test results.
Access status: Open Access ,
Uogólnione podejście do aktualizacji indeksów w obiektowej bazie danych
(Wydawnictwa AGH, 2009) Kowalski, Tomasz Marek; Kuliberda, Kamil; Draus, Cezary; Adamus, Radosław; Wiślicki, Jacek
We describe a generalized approach to the problem of the automatic index updating in response to modification of corresponding data. To enable creation and transparent maintenance of indices supporting keys defined using arbitrary, deterministic and side effects free expressions the authors propose applying a special kind of database triggers. Query language for object-oriented model (classes, inheritance, polymorphism, class methods, etc.) allows easy defining of more complex selection predicates, nevertheless, in order to provide full indexing transparency, index updating requires substantial revising. Inadequate index maintenance can lead to serious errors in query processing. The authors work is based on the Stack-Based Architecture (SBA) and has been implemented in the ODRA (Object Database for Rapid Applications Development) OODBMS prototype.