243 search results - page 22 / 49 » Selectivity Estimation for Boolean Queries |
GLOBECOM
2009
IEEE
15 years 4 months ago
2009
IEEE
— In this paper, we study the anonymous cardinality estimation problem in radio frequency identification (RFID) systems. To preserve privacy and anonymity, each tag only transmi...
ICDE
2006
IEEE
15 years 3 months ago
2006
IEEE
XML structural joins, which evaluate the containment (ancestor-descendant) relationships between XML elements, are important operations of XML query processing. Estimating structu...
PVLDB
2008
14 years 9 months ago
2008
Estimates of predicate selectivities by database query optimizers often differ significantly from those actually encountered during query execution, leading to poor plan choices a...
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Tuning database system configuration parameters to proper values according to the expected query workload plays a very important role in determining DBMS performance. However, the ...
VLDB
2002
ACM
14 years 9 months ago
2002
ACM
Many valuable text databases on the web have non-crawlable contents that are "hidden" behind search interfaces. Metasearchers are helpful tools for searching over many s...