Even after the optimizer determines a degree of parallelism for the query as a whole, Adaptive Server may make final adjustments at runtime to compensate for the actual number of worker processes that are available. If fewer worker processes are available at runtime than are suggested by the optimizer, the degree of parallelism is reduced to a level that is consistent with the available worker processes and the access methods in the final query plan. “Runtime adjustment of worker processes” describes the process of adjusting the degree of parallelism at runtime and explains how to determine when these adjustments occur.
