High availability on-line transaction processing system

Details High availability on-line transaction processing system High availability on-line transaction processing system

1997-02-10

1999-11-30

An, Meng-Ai T.

Electrical computers and digital processing systems: multicomput

Distributed data processing

Client/server

709101, 709200, 709208, 709223, 709249, 714 4, 714 43, 714 56, 714712, 714717, G06F 944

Patent

active

059960019

ABSTRACT:
A high availability on-line transaction processing (OLTP) system utilizes both hardware and software. Geographically separated primary (live) and backup (shadow) communications servers link live and shadow OLTP systems to geographically separated live and shadow Wide Area Networks and remote client computers. The remote client computers communicate with the live and shadow OLTP systems through their respective live and shadow WANs and communications servers. The live OLTP system sends "keep-alive" messages to the shadow system via the dedicated circuits on a frequent basis. If the shadow OLTP system does not receive a keep-alive message from the live system within a designated time interval, it sends "probe messages" to the live communications servers and live OLTP system, via the shadow WAN, client computers and live WAN to determine their status. If the live communications servers respond to the probe message(s) but the live OLTP system does not, the shadow OLTP system deduces that the live OLTP system failed and automatically takes over the role of the live system without operator intervention.

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