---

title: Notes of System Design No.01 —Answering the SDIs Step by Step
description: 'Answering the SDIs Step by Step ’
date: 2022-05-04 14:52:06
tags: 系统设计
categories:

• 系统设计

---

In this Article ,

I will give a introduction to

the guildline of answering the SDIs(system design interviews) problem

lets get into it!

Mainly Reference:https://www.educative.io/courses/grokking-the-system-design-interview

Step 1: Requirements clarifications

在一开始的时候问清楚设计的一些关键指标，缩小设计范围

Define the end goals And clarifying ambiguities early in the interview is critical.

Step2 System interface Design

明确这个系统会需要哪些接口

Step3 Back-of-the-envelope estimation

粗略的估计系统的规模

Step4 Defining data model

确定数据结构

Step5 High-level design

顶层设计，用框图的形式画出系统的结构

Step6 Detailed Degisn

根据面试官感兴趣的方向,

针对里面的2-3个模块作重点且细节的讨论

可以给出几种不同的设计方案 然后说出利弊

然后说明为什么用目前的这个设计方案。

Step7 Identifying and resolving bottlenecks

尽可能多的找到目前系统存在的弊端

然后给出不同的解决方案去处理它