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.