Reading or writing data requires a disk to access the disk sector where the requested data resides. After this sector is accessed, the amount of time required for a disk to read or write data from or to storage media is referred to as disk transfer time.
Transfer time, usually expressed in milliseconds, is part of the disk access time, that is, the total time required for the computer to process the data request from the processor and then retrieve the needed data from a storage device.
Dispatcher is a background process, which is responsible for routing requests from connected user processes to available shared server processes, and for returning the responses back to the appropriate user processes.
The dispatcher process, which is only utilized with shared server configuration, handles and directs multiple incoming network session requests to shared server processes. At least one dispatcher process has to be created for every communication protocol available on the server.