Makes allowance for data skew in the build relation. SkewAllowance specifies a percentage factor used by the Optimizer in choosing the size of each hash join partition.
SkewAllowance reduces the memory size for the hash join specified by HTMemAlloc. This allows the Optimizer to take into account a potential skew of the data that could make the hash join run slower than a merge join.
20 though 80%
This is the recommended setting.
Changes Take Effect
After the DBS Control Record has been written.