> > All the FB articles/docs/postings that I have seen have said for > > performance, index depth should be no more than 3. > > This is not a hard requirement, 4 levels may be also OK. Are those multi- > segment indices primary/unique keys or just for lookup purposes?
{Sorry for the delay in responding, was away on vacation}
Most of our PK are generator values, the multi-segment indexes are to optimize
commonly used queries.
Sean
