Back-of-the-Envelope Estimation — pick a scenario
0/4 donePick one and press Start, then click Next › to step through it.
Watch forThe reads line settling an order of magnitude above the writes line right beneath it.
More about this scenario
You'll learnWhy a timeline is a caching problem before it is a database problem: twenty reads arrive for every write.
How it runsPosts per day divide down to a rate per second, the peak factor lifts it, and the view-to-post ratio multiplies it into the read rate.