Teradata

Teradata is the absolute, unshakeable grandfather of the massive enterprise Data Warehousing space. Long before the term "Big Data" or "Cloud" existed, massive global airlines, banks, and retailers were using Teradata mainframes to analyze billions of rows of data. While startups mock it as "legacy," it remains deeply entrenched because it handles incredibly complex, highly concurrent SQL queries faster and more reliably than almost anything else on earth. Its flagship product, Teradata Vantage, has aggressively modernized. While they historically sold massive physical hardware racks (which they still do), they have transitioned heavily to a hybrid multi-cloud model. A massive global bank can run Vantage on-premise in London for extreme security, and simultaneously run Vantage in AWS in New York, querying the data seamlessly across both environments. Its absolute greatest strength is "Concurrency." If 10,000 corporate analysts at a massive global retailer all log in at 9:00 AM on Monday and simultaneously click "Run Report" on a dashboard that queries a 5-petabyte sales table, many modern cloud databases will crash or queue the queries for hours. Teradata's deeply proprietary workload management engine can handle those 10,000 massive simultaneous queries without breaking a sweat.