Original link: Db2 is a story worth telling, even if IBM won't / TheRegister.
The previous link: AI query optimization in IBM's Db2 shows you can teach a tech dinosaur new tricks.
DB2 was the first SQL database and it is used by some really big customers - the 2 articles list: American Express, Bank of America, Citibank, JP Morgan Chase, HSBC, Deutsche Bank and Tesco.It runs on z, i, AIX, Linux and Windows. There is a free community version available for those that want to check it out here.
But despite all of that then very few has heard about it and even fewer has used it.
Oracle DB, MS SQLServer, MySQL and PostgreSQL get all the press.
Larry Ellison is way better than IBM to get in the media!