Point of sale
Retail industry

A multi-terminal POS system used by big retailers like supermarkets and department stores has a far more demanding database and software architecture than that of a single station seen in small retail outlets. A supermarket with high traffic cannot afford a systemic failure, hence each point of sale station is designed to be robust in its operation. Most proprietary POS systems designed for large retailers use 2 servers, with one acting as a backup in case of failure. In the event that both servers fail, the individual POS systems will enter a failsafe mode, where sales data is stored locally and exported back to the servers upon a return of the connection. This may prove challenging to implement in some instances however, as many commercial POS systems do not have any hard disks for security purposes, and often have limited amounts of RAM.
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