[NineChap Sys] System Design Class 2 - Shuatiblog.com

[NineChap Sys] System Design Class 2 - Shuatiblog.com

This class covers database design:

1. design data with class and inheritance
2. design a user system (Netflix 2015)
3. design a payment system (Yelp, BigCommerce 2015)

Example One

design account (login/out) system for our radio.

Step one, scenario

1. register, update, remove account
2. login/out
3. user balance, VIP services

Step Two, necessary

1. Ask

   1. total user: 100 million
   2. daily user: 1 million

2. predict

   1. daily active user in 3 month: 10 million
   2. register percentage: 1%
   3. daily new register: 100 thousand

3. more predict

   1. login percentage: 15%
   2. average login frequency: 1.2 (ppl may input wrong password 20% of time)
   3. daily login attempts: 10 million * 15% * 1.2 = 1.8 million
   4. average login frequency: 1.8 million / 24hr = 21 login/sec
   5. normal login frequency: 21 * 2 = 42 login/sec
   6. peak login frequency: 42 * 3 = 126 login/sec

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