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I’d take oracle over MS SQL any day. That said I’d take PostgreSQL over oracle any day.

Curious if that is from recent experience? I used Oracle decades ago but these days it's all SQL Server.

Yes, it's the isolation levels. I want row level locking. I want to have 1 insert and 20 selects running at the same time without getting a lock.

Under SQL Server’s SNAPSHOT transaction isolation level, writers don’t block readers. We use it in production with good results.

While the internal implementation details differ from Oracle, the end result seems quite similar in practice.