Q1: Regarding indexing foreign keys on InnoDB
Is this required? Is it a best practice?
Q2: If the answer to Q1 is `Yes`, what about if I have two FK's and I only ever reference them at the same time--should I create individual indices along with the group index, or would the group index suffice?
EG: Table name = Object
Object has two FK's: User1, User2
I only ever access the table while searching using WHERE User1='' AND User2=''.
Any incites from gd's sql gurus would be much appreciated and ++thanks in advance.