Výsledky vyhledávání

Time–HOBI: Index for optimizing star queries

Autor: Jan Chmiel, Artur Wojciechowski, Tadeusz Morzy, Robert Wrembel

Publikováno v: Information Systems. 37:412-429

One of the important research and technological problems in data warehouse query optimization concerns star queries. So far, most of the research focused on optimizing such queries by means of join indexes, bitmap join indexes, or various multidimens

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7f587e3de5070d99e8fbfeebdc97a79e
https://doi.org/10.1016/j.is.2011.06.002

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Multiversion join index for multiversion data warehouse

Autor: Jan Chmiel, Robert Wrembel, Tadeusz Morzy

Publikováno v: Information and Software Technology. 51:98-108

The data warehouse (DW) technology is developed in order to support the integration of external data sources (EDSs) for the purpose of advanced data analysis by On-Line Analytical Processing (OLAP) applications. Since contents and structures of integ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::223ea234fa79b1445ae36058faf24d62
https://doi.org/10.1016/j.infsof.2008.01.003

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Time-HOBI

Autor: Tadeusz Morzy, Robert Wrembel, Jan Chmiel

Publikováno v: DOLAP

One of the important research and technological problems in data warehousing is the optimization of star queries. So far, most of the research focused on optimizing such queries by means of join indexes and bitmap join indexes. In this paper we propo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5633ea0bf694d86aa31c97972094af1c
https://doi.org/10.1145/1871940.1871957

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Indexing Multiversion Data Warehouse: From ROWID-Based Multiversion Join Index to Bitmap-Based Multiversion Join Index

Autor: Jan Chmiel

Publikováno v: Advances in Databases and Information Systems ISBN: 9783642120817
ADBIS (Workshops)

This paper presents two index structures, called a Bitmap-based Multiversion Join Index (B-MVJI), designed for the optimization of star queries that access multiple data warehouse versions. The B-MVJI indexes a two-dimensional space data values - dat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3bdad1fcae37a4b835416633683a93e1
https://doi.org/10.1007/978-3-642-12082-4_10

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Data Structures for Multiversion Data Warehouse

Autor: Jan Chmiel

Publikováno v: Advances in Databases and Information Systems ISBN: 9783642120817
ADBIS (Workshops)

In this paper we present data structures for the Multiversion Data Warehouse (MVDW). The data structures include: (1) BitmapSharing – developed for sharing data between multiple DW versions and (2) a MultiVersion Join Index – developed for suppor

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::68b6d6872110a2da6661633bcd132af9
https://doi.org/10.1007/978-3-642-12082-4_26

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HOBI: Hierarchically Organized Bitmap Index for Indexing Dimensional Data

Autor: Tadeusz Morzy, Jan Chmiel, Robert Wrembel

Publikováno v: Data Warehousing and Knowledge Discovery ISBN: 9783642037290
DaWaK

In this paper we propose a hierarchically organized bitmap index (HOBI) for optimizing star queries that filter data and compute aggregates along a dimension hierarchy. HOBI is created on a dimension hierarchy. The index is composed of hierarchically

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e3acd8232c1a9d4d7cd3cec0a07004c7
https://doi.org/10.1007/978-3-642-03730-6_8

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