Some years ago a Major Danish bank suffered a black swan event where their entire online financial system went down. It was traced to a bizarre problem in an IB

Some years ago a Major Danish bank suffered a black swan event where their entire online financial system went down. It was traced to a bizarre problem in an IBM DB2 database that had never occurred before. In the entire history of DB2. All kinds of experts were flown in from all over the world to fix it, and eventually they succeeded with some loss of data. The result? Customers of the bank were unable to make any transactions for 5 days, and the bank's stock suffered so severely that the company lost almost a billion dollars in market cap within a week. Now they have redundant sytems...