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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F12%3A10123432%21RIV13-GA0-11320___
rdf:type
skos:Concept n16:Vysledek
dcterms:description
Due to increasing capacity of storage devices and speed of computer networks during last years, it is still more required to sort and search data effectively. A query result containing thousands of rows from a relational database is usually useless and unreadable. In that situation, users may prefer to define constraints and sorting priorities in the query, and see only several top rows from the result. This paper deals with top-k queries problems, extension of relational algebra by new operators and their implementation in a database system. It focuses on optimization of operations join and sort. The work also includes implementation and comparison of some algorithms in standalone .NET library NRank. Due to increasing capacity of storage devices and speed of computer networks during last years, it is still more required to sort and search data effectively. A query result containing thousands of rows from a relational database is usually useless and unreadable. In that situation, users may prefer to define constraints and sorting priorities in the query, and see only several top rows from the result. This paper deals with top-k queries problems, extension of relational algebra by new operators and their implementation in a database system. It focuses on optimization of operations join and sort. The work also includes implementation and comparison of some algorithms in standalone .NET library NRank.
dcterms:title
NRank: A Unified Platform Independent Approach for Top-K Algorithms NRank: A Unified Platform Independent Approach for Top-K Algorithms
skos:prefLabel
NRank: A Unified Platform Independent Approach for Top-K Algorithms NRank: A Unified Platform Independent Approach for Top-K Algorithms
skos:notation
RIV/00216208:11320/12:10123432!RIV13-GA0-11320___
n16:predkladatel
n21:orjk%3A11320
n3:aktivita
n12:P
n3:aktivity
P(GAP202/10/0761)
n3:dodaniDat
n17:2013
n3:domaciTvurceVysledku
n10:5822769
n3:druhVysledku
n15:D
n3:duvernostUdaju
n23:S
n3:entitaPredkladatele
n11:predkladatel
n3:idSjednocenehoVysledku
154919
n3:idVysledku
RIV/00216208:11320/12:10123432
n3:jazykVysledku
n18:eng
n3:klicovaSlova
Rank Join; Relational Database; Top-k Query
n3:klicoveSlovo
n4:Relational%20Database n4:Top-k%20Query n4:Rank%20Join
n3:kontrolniKodProRIV
[0DCB25C23083]
n3:mistoKonaniAkce
Řím, Italie
n3:mistoVydani
Stubal, Portugalsko
n3:nazevZdroje
DATA 2012 - Proceedings of the International Conference on Data Technologies and Applications
n3:obor
n6:IN
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
2
n3:projekt
n13:GAP202%2F10%2F0761
n3:rokUplatneniVysledku
n17:2012
n3:tvurceVysledku
Pokorný, Jaroslav Čech, Martin
n3:typAkce
n20:WRD
n3:zahajeniAkce
2012-07-25+02:00
s:numberOfPages
6
n14:doi
10.5220/0003966901110116
n22:hasPublisher
SciTePress
n8:isbn
978-989-8565-18-1
n19:organizacniJednotka
11320