Inverse Query Failures

I was asked to look into invers queries going wrong in order to determine which additional indices might be useful. I looked at 5245997 recent queries 6236 (0.11%) of which were reverse. Of these 1428 (24.72%) failed because no match could be found and 461 (7.39%) failed because either no attribute name was given or an attribute name which does not have an inverse index was given. Unfortunately no more details are logged about the latter type of failures. We will change that a.s.a.p. and report back if there are signigficant findings. I have looked at the data that was logged and could detect no clear trends pointing to the need for additional indices. Daniel