All,
When there is no primary key on the source table, and we need to do manual selection for the key how to make choice for split-by key, :
1) is it supposed to be numeric? or varchar is fine too? 2) can it have nulls 3) I suppose distribution of values for the column should be as even as possible, but will it matter how many maps I am choosing (--num-map ## )? or any other criteria to pay attention to?
thanks Abhijeet
