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> I'm still curious why IBM hasn't gotten Amazon to host some System Z DB2 mainframes to compete.

Why would they use AWS? They have their own cloud: https://cloud.ibm.com/catalog#services

There are some areas where Oracle indeed offers more features (mainly in the administration/monitoring area) compared to Postgres, but PL/SQL vs. PL/pgSQL as a procedural language PL/pgSQL is not one of them. Both languages are pretty much on par

https://www.ibm.com/cloud/hyper-protect-dbaas is built on Z

Not System Z but Power: https://cloud.google.com/ibm/

> Personally I chose SQLite sharded on S3

This sounds interesting, would you mind sharing details?