Over the past 10 years I've had the misfortune of working with most major historians in the field (Oracle's the biggest one I never encountered) and not a single one implemented process data storage on top of a relational database. Some used relational databases to store asset metadata, so maybe that's what you're thinking of?
If you read all the way to the end Stonebraker is actually advocating for specialized architectures like, array databases (SciDB) and stream processing engines like StreamBase, which at the time was just gaining GUI-based query creation capabilities because it was difficult to teach its non-relational concepts to SQL users.
If you read all the way to the end Stonebraker is actually advocating for specialized architectures like, array databases (SciDB) and stream processing engines like StreamBase, which at the time was just gaining GUI-based query creation capabilities because it was difficult to teach its non-relational concepts to SQL users.