Range predicates selectivity CBO cardinality estimation for range predicates
Join Over Histograms CBO cardinality estimation for equi-joins over columns with histograms collected
Distinct Balls expected number of distinct values when selecting from a bag(urn,box) without replacement (formulae and proofs)
Select Without Replacement CBO's use of the previous formula for cardinality estimation (DISTINCT/GROUP BY, joins)
11g NewDensity a short note about CBO's "NewDensity" in version 11g
NoCOUG SQL Challenge solving a statistical problem via the FFT implemented using the MODEL clause