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RETAIN
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=== Mirrored database === In the mid-1970s, a RETAIN was expanded to permit multiple copies of the database to be hosted on geographically distributed systems. RETAIN's custom-built Data Bank Manager, which served as the foundation for all RETAIN applications, and the IRIS search engine, was modified to support "mirroring" of file updates to take place automatically across the network, in a manner nearly invisible to the application programs, but which providing a high level of data integrity. After this change, RETAIN hosts were created in two US locations, two in Europe, two in South America, and two in Japan. Most applications were developed by IBM programmers in Raleigh, NC, (moved to Boulder, Colorado, in 1976) with some work being done in North Harbour, UK. Registered users of the system numbered in the thousands, in over 60 countries.
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