How to design a system

How to design a system

##Step 1: Describe usage scenarios, constraints and assumptions(Recommended learning: PHP video tutorial)

Gather all the necessary things together and examine the problem. Keep asking questions so that we can clearly understand usage scenarios and constraints. Discuss assumptions.

Who will use it?

How will they use it?

How many users are there?

What is the function of the system?

What are the input and output of the system?

How much data do we want to process?

What is our desired read-write ratio?

Step 2: Create a high-level design

Use all important components to outline a high-level design

Draw the main Components and connections

Prove your idea

Step 3: Design core components

For each core component Conduct detailed and in-depth analysis. For example, if you are asked to design a URL abbreviation service, start the discussion:

Generate and store a hash of the complete URL

MD5 and Base62

Hash collision

SQL or NoSQL

Database model

Translate a hashed url into a complete url

Database lookup

API and object-oriented design

Step 4: Measurement Design

Identify and deal with bottlenecks and limitations.

For example, do you need the following to complete an expanded topic?

Load Balancing

Horizontal Scaling

Cache

Database Sharding

Discuss possible solutions and costs. Everything requires trade-offs.

Bottlenecks can be handled using scalable system design principles.

Estimated Estimated Amount

You may be asked to make some estimates through hand calculations.

The appendices involved involve the following resources:

Using the power table of the estimated calculation quantity

2

The number of delays that every programmer should know

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