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Requirements for IMS 7.1 and HALDB Database Changes

Category: IMS
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For the past few decades, the IMS database arena has been very quiet. The last major enhancements were the addition of VSAM support in the mid-1970s and the introduction of Fast Path databases in the late 1970s. OSAM was enlarged to allow a 4 GB size limit in the 1980s and again to 8 GB in the 1990s.

The new century starts with a big bang. IMS 7.1 introduces high availability large databases (HALDB), and the analogy to a computer in a famous Arthur C. Clark novel is probably purely accidental. When I was confronted with HALDB for the first time, I considered spelling it "HELLDB" because of the amount of work that this would create.


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