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DAWAK
2005
Springer
14 years 2 months ago
Efficient Compression of Text Attributes of Data Warehouse Dimensions
This paper proposes the compression of data in Relational Database Management Systems (RDBMS) using existing text compression algorithms. Although the technique proposed is general...
Jorge Vieira, Jorge Bernardino, Henrique Madeira
ER
2003
Springer
550views Database» more  ER 2003»
14 years 1 months ago
A UML Based Approach for Modeling ETL Processes in Data Warehouses
Data warehouses (DWs) are complex computer systems whose main goal is to facilitate the decision making process of knowledge workers. ETL (Extraction-Transformation-Loading) proces...
Juan Trujillo, Sergio Luján-Mora
ICIAR
2010
Springer
14 years 1 months ago
Entropy of Gabor Filtering for Image Quality Assessment
Abstract. A new algorithm for image quality assessment based on entropy of Gabor filtered images is proposed. A bank of Gabor filters is used to extract contours and directional ...
Esteban Vázquez-Fernández, Án...
EDBT
2009
ACM
160views Database» more  EDBT 2009»
14 years 1 months ago
Estimating aggregates in time-constrained approximate queries in Oracle
The concept of time-constrained SQL queries was introduced to address the problem of long-running SQL queries. A key approach adopted for supporting time-constrained SQL queries i...
Ying Hu, Seema Sundara, Jagannathan Srinivasan
ISMIS
1999
Springer
14 years 23 days ago
A Statistical Approach to Rule Selection in Semantic Query Optimisation
Semantic Query Optimisation makes use of the semantic knowledge of a database (rules) to perform query transformation. Rules are normally learned from former queries fired by the u...
Barry G. T. Lowden, Jerome Robinson