we still have an informix db for an old early 2000s application we have to support. shit runs on centos5 lmao. it's actually not too bad, around v12 there's cdc capabilities (requires you to build your own agent service to consume the data) that made the exercise of real time replicating the app db in our edw a cakewalk. which ironically has greatly extended the lifespan of the application since no one has to query informix anymore directly.
ibms docs and help sites suck butt tho.