The CPU Costing Model – A Few Thoughts Part II

As previously discussed, the formula used by the CBO using the CPU costing model is basically:
(sum of all the single block I/Os x average wait time for a single block I/O +
 sum of all the multiblock I/Os x average wait time for a multiblock I/O +
 sum of all the required CPU cycles / CPU cycles per second)
average [...]