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Have you EVER actually worked on a reasonably sized system ?

Because there are a lot more contributors to request/response performance than just database indexes. Especially when you are at the scale of Paypal.

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I have, and I can tell you that the speed at which they are able to search for transactions is disturbing. Regardless of if it's related to indexes or another cause, it's still a huge issue for people who have to use PayPal. That appears to be the point the parent comment was trying to make.

Your comment had the potential to be constructive and educational, but instead you took a condescending approach. That's unfortunate.

The point I was trying to make was that of all possible transaction searches you can make, one made on the transaction id should be the easiest one to make fast.

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