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Re:Kerf: a columnar tick database for Linux, OS X, BSD, iOS,... by pmontra on Friday June 26, 2015 @07:05AM (#9783508)
I had no idea and googled this page https://www.mongodb.com/post/45116404296/how-banks-use-mongo...

"Tick databases are real-time database servers for capturing, managing, and processing market data."

They go into the requirements after that.

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