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1. HN Tooter (hntooter@mastodon.social)'s status on Saturday, 23-Dec-2017 11:35:57 UTC HN Tooter

   Why IBM DB2 is four different DBMS code bases
   http://perspectives.mvdirona.com/2017/12/1187/

   (submitted by fanf2)

   • Stephen Michael Kellat and Hallå Kitteh repeated this.
   • Hallå Kitteh (clacke@social.heldscal.la)'s status on Friday, 29-Dec-2017 06:48:37 UTC Hallå Kitteh

     in reply to

     • Jason_Dodd
     This was an interesting read, but only raised new questions. :-)
     
     So, DB/2 is four different codebases because there's generic DB2, DB2 for i, DB2 for Z and DB2 for VM & VSE.
     
     The obvious followup article is why there are three OSes z/OS, z/VM and z/VSE for one and the same IBM mainframe!
     
     Maybe @jasondodd knows?
     
     I mean, obviously historical reasons, but how different are they really?