619 search results - page 93 / 124 » Query Planning in Infomaster |
199
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ICDE
2008
IEEE
16 years 3 months ago
2008
IEEE
We study the problem of computing query results with confidence values in ULDBs: relational databases with uncertainty and lineage. ULDBs, which subsume probabilistic databases, o...
178
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ICDE
2007
IEEE
16 years 3 months ago
2007
IEEE
Traditional DBMSs decouple statistics collection and query optimization both in space and time. Decoupling in time may lead to outdated statistics. Decoupling in space may cause s...
128
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SIGMOD
2004
ACM
16 years 2 months ago
2004
ACM
Spatial Database Management Systems (SDBMS), e.g., Geographical Information Systems, that manage spatial objects such as points, lines, and hyper-rectangles, often have very high ...
108
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BTW
2007
Springer
15 years 8 months ago
2007
Springer
: Database-internal statistics are very important for cost-based query optimizers. Only if an optimizer has accurate statistical information about data, it provides excellent execu...
107
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VLDB
2004
ACM
15 years 7 months ago
2004
ACM
When query optimizers erroneously assume that database columns are statistically independent, they can underestimate the selectivities of conjunctive predicates by orders of magni...