I'm interested in building a stock market-like application with orders, quotes, bid/ask prices etc...I can easily see this being represented in a relational database (and for my volume SQL would suffice), but I can't imagine real exchanges use SQL processing billions of order per day? What does their stack look like?
Here’s a blog post from a former employee at a new startup comparing kdb against some alternative databases for common operations on financial data: https://medium.com/prooftrading/selecting-a-database-for-an-...