I have a process that has worked fine for over
a year. Today the system is locking up and I'm
not sure why.

I suspect that it may be the result of a corrupted
index tag. Is there a way to tell if an index tag is
indeed corrupted? Is there a rule of thumb as
to how often the rebuild should take place?
I've also heard that I should not simply do a
REINDEX but that it should be a DELETE TAGS ALL
and then create the indexes. Is there an automated
way to do this?