If a highly-critical application is I/O bound and the other applications are compute-bound, the compute bound process can use the CPU for full timeslice if it is not blocked for some other reason.
An I/O-bound process, however, yields the CPU each time it performs an I/O operation. Assigning a unpreferred execution class to the compute-bound application enables Adaptive Server to run the I/O-bound process sooner.
