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The well-constructed relational databases just seemed to work. They didn't require endless tinkering and maintenance. Tables were well normalised, narrow, appropriate, and ingenious. Constraints and keys abounded. The data model fitted the business like a glove. The SQL was simple because it just needed to declare what result was required, no hints, no fancy stuff, and only rarely extra indexes. The effort was focused on maintaining an immaculate, normalized representation of the organization's data. On the rare occasion that a query was slow, the dev teams assumed that the fault lay in the data model, and they'd fix it.
There was one such database I knew that was responsible for the clearing of cheques for a major retail bank. It processed millions of business transactions a day. The team, a handful of people that created and maintained it, were nearing retirement so two major IT projects, involving hundreds of bright young developers, aimed to replace the system. Both failed. The original team became used to being called away from tending their roses to maintain the system that kept the organization functioning.
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