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Code Issues

More optimistic selectivity estimations. In the worst case, it's much easier to disable index usage rather then enable it.

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dimitr 2006-06-27 06:39:22 +00:00
parent 05aa0c04bf
commit bfffbb196f
1 changed files with 3 additions and 3 deletions
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6
src/jrd/Optimizer.h
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@ -48,9 +48,9 @@ namespace Jrd {
// AB: 2005-11-05
// Constants below needs some discussions and ideas
const double REDUCE_SELECTIVITY_FACTOR_BETWEEN = 0.2;
const double REDUCE_SELECTIVITY_FACTOR_LESS = 0.5;
const double REDUCE_SELECTIVITY_FACTOR_GREATER = 0.5;
const double REDUCE_SELECTIVITY_FACTOR_BETWEEN = 0.0025;
const double REDUCE_SELECTIVITY_FACTOR_LESS = 0.05;
const double REDUCE_SELECTIVITY_FACTOR_GREATER = 0.05;
const double REDUCE_SELECTIVITY_FACTOR_STARTING = 0.01;
const double MAXIMUM_SELECTIVITY = 1.0;