Transactional integrity becomes trickier when you blnd two storage systems. The orthogonal idea of keeping a premarkedup version has worked well for me as an o

Transactional integrity becomes trickier when you blnd two storage systems. The orthogonal idea of keeping a premarkedup version has worked well for me as an optimization. I use triggers to delete the marked up copy when any of its inputs change. The access function recreates it if needed.