MUMPS Maintenance
Massachusetts General's hierarchical-database language — cryptic one-letter commands, persistent global arrays, and an unkillable presence in hospital records systems.
MUMPS (Massachusetts General Hospital Utility Multi-Programming System, 1966) — Neil Pappalardo's hospital database language — combined a sparse-array persistent database with a terse imperative syntax.\n\nIt still runs as M, powering the US Veterans Affairs VistA system and most of the world's hospital records — possibly the largest invisible codebase in medicine.
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