902 search results - page 121 / 181 » Efficient and Extensible Algorithms for Multi Query Optimiza... |
162
Voted
PODS
2002
ACM
16 years 2 months ago
2002
ACM
We consider the fundamental operation of applying a conjunction of selection conditions to a set of records. With large main memories available cheaply, systems may choose to keep...
185
Voted
ICDE
1999
IEEE
16 years 3 months ago
1999
IEEE
Indexes play a vital role in decision support systems by reducing the cost of answering complex queries. A popular methodology for choosing indexes that is adopted by database adm...
213
Voted
SIGMOD
2008
ACM
16 years 2 months ago
2008
ACM
Supporting ranking queries in database systems has been a popular research topic recently. However, there is a lack of study on supporting ranking queries in data warehouses where...
320
Voted
SIGMOD
2006
ACM
16 years 2 months ago
2006
ACM
Given a dataset P and a preference function f, a top-k query retrieves the k tuples in P with the highest scores according to f. Even though the problem is well-studied in convent...
139
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BMCBI
2006
15 years 2 months ago
2006
Background: Sequence comparison is one of the most prominent tools in biological research, and is instrumental in studying gene function and evolution. The rapid development of hi...