Sciweavers

367 search results - page 35 / 74
» Algorithms for selecting materialized views in a data wareho...
Sort
View
SIGMOD
2009
ACM
157views Database» more  SIGMOD 2009»
14 years 9 months ago
Asynchronous view maintenance for VLSD databases
The query models of the recent generation of very large scale distributed (VLSD) shared-nothing data storage systems, including our own PNUTS and others (e.g. BigTable, Dynamo, Ca...
Parag Agrawal, Adam Silberstein, Brian F. Cooper, ...
DBKDA
2010
IEEE
169views Database» more  DBKDA 2010»
14 years 1 months ago
XLeaf: Twig Evaluation with Skipping Loop Joins and Virtual Nodes
Abstract—XML indexing and search has become an important topic, and twig joins are key building blocks in XML search systems. This paper describes a novel approach using a nested...
Nils Grimsmo, Truls Amundsen Bjørklund, &Os...
IDEAS
1999
IEEE
123views Database» more  IDEAS 1999»
14 years 1 months ago
Improving OLAP Performance by Multidimensional Hierarchical Clustering
Data-warehousing applications cope with enormous data sets in the range of Gigabytes and Terabytes. Queries usually either select a very small set of this data or perform aggregat...
Volker Markl, Frank Ramsak, Rudolf Bayer
PVLDB
2010
80views more  PVLDB 2010»
13 years 7 months ago
Using Sentinel Technology in the TARGIT BI Suite
This paper demonstrates so-called sentinels in the TARGIT BI Suite. Sentinels are a novel type of rules that can warn a user if one or more measure changes in a multi-dimensional ...
Morten Middelfart, Torben Bach Pedersen
SIGMOD
1998
ACM
121views Database» more  SIGMOD 1998»
14 years 1 months ago
New Sampling-Based Summary Statistics for Improving Approximate Query Answers
In large data recording and warehousing environments, it is often advantageous to provide fast, approximate answers to queries, whenever possible. Before DBMSs providing highly-ac...
Phillip B. Gibbons, Yossi Matias