PVLDB
2008
13 years 4 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...
ICDE
2007
IEEE
13 years 10 months ago
2007
IEEE
Most database query optimizers use cost models to identify good query execution plans. Inaccuracies in the cost models can cause query optimizers to select poor plans. In this pap...