alt Hacker NewsBut how hard is it for your companies to migrate?
Is it worth the risk/work to move everything over? For a lot of enterprises, their needs to be a huge cost savings or risk reduction. Risk usually being the most important factor the bigger the company.
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If it's the same for others as it was for us recently then very difficult... but the cost savings were so massive in terms of margin the risk was worth it. What taylodl mentioned about growing institutional knowledge and experience with Postgres in other apps first rang true as well. We are not 100% Oracle free, but we have migrated much away already.
In the larger discussion, I also wonder what their new contract rate is for these solutions. Even if 0% were migrating off, if 0% were migrating on then the net rate would still be decently negative because of natural business/app attrition.
I know of one largish bank moving away from Oracle middleware and RDMS. It's happening in pieces starting with low hanging fruit and for awhile the two will run in parallel (with the new data stores starting off as a comparison check to reconcile any bugs that crop up). Some early wins were account transaction logs that can go into better suited DBs, etc.
My understanding is that they were relatively lucky in that most of the hard parts are in the middleware layer and rarely the DB itself - the bank has been around since the 1800s, so has a huge mishmash of technologies that go from old IBM mainframes up to more modern cloud infra. So they're already kind of used to using middleware logic to stitch together various data sources.
The funny thing is that my contact there said the primary impetus is that they see the writing on the wall for a lot of their "legacy" Sun hardware, and figure if they're going to have to redo a lot of it, they may as well re-architect the rest. There'll still be oracle DBs running in the bank for a looong time, but there'll be less and less of it.