Abstract: In a system for providing telecommunications relay service, the delay in assigning an attendant to an established relay session after the text-to-speech conversion process may be controlled by establishing new relay sessions, in response to requests therefor, only if a) less than a predetermined maximum number K of relay sessions have already been established, b) none of the established relay sessions are queued and waiting for an attendant and c) an attendant is available. An established relay session is one that is 1) being served by an attendant, 2) is waiting to be reconnected to an attendant or 3) is in the midst of the text-to-speech conversion process. The value of K is greater than or equal to the number of attendants. It is determined dynamically, as a function of 1) a given set of performance objectives, 2) the current set of traffic characteristics, 3) the current performance characteristics and 4) the resources available at the telecommunications relay service center.

Abstract: A failure rate independent system for achieving zero defect data integrity in a computer transaction system is disclosed. The system receives events from an event generator and stores the raw events to disk. Structural information relating events to transactions is not stored on disk. Data which is lost after a system failure is reconstructed from the raw events during recovery. Transaction processing capacity is increased by trading off the continual updating of disk stored events and associated structural information for the post recovery reconstruction of structural information. As a result, zero defect data integrity is achieved at minimum processing cost.