What Is System Design? - Undercode Testing

System design is the blueprint of a system, outlining its architecture, components, interfaces, and data flow to fulfill specific requirements. It’s about crafting a detailed plan that ensures the system is functional, scalable, and reliable.

Why is System Design Crucial?

Scalability: Allows systems to grow smoothly with user and data increases.
Reliability: Guarantees consistent performance and swift recovery from failures.
Maintainability: Simplifies updates, bug fixes, and feature enhancements.
Performance: Optimizes resources for fast and responsive user experiences.
Security: Integrates protection against threats and vulnerabilities.
Cost Efficiency: Creates economical systems for development, maintenance, and operation.

Key Components of System Design

Architecture Design: Focuses on the system’s high-level structure, defining how components interact.
Interface Design: Develops user interfaces and APIs for seamless communication.
Data Design: Defines data structure for efficient storage and retrieval.
Module Design: Breaks the system into manageable modules for easier development.

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You Should Know: Essential Commands & Practices for System Design

Linux & System Monitoring

Check System Load:
```
uptime 
```
Monitor Processes:
```
top 
htop 
```
Disk Usage:
```
df -h 
du -sh<br />
```
Network Connections:
```
netstat -tuln 
ss -tuln 
```

Database Optimization

MySQL Query Analysis:

EXPLAIN SELECT  FROM users WHERE id = 1;

PostgreSQL Performance Check:
```
SELECT pg_stat_activity(); 
```

Cloud & Scalability (AWS CLI)

List EC2 Instances:
```
aws ec2 describe-instances 
```

Auto Scaling Groups:

aws autoscaling describe-auto-scaling-groups

Security Best Practices

Check Open Ports:
```
nmap -sV <IP> 
```

Firewall Rules (UFW):

sudo ufw allow 22/tcp 
sudo ufw enable

Windows System Checks

Check Running Services:

Get-Service | Where-Object { $_.Status -eq "Running" }

Disk Performance:

Get-Counter "\LogicalDisk()\% Free Space"

What Undercode Say

System design is the backbone of scalable and efficient software. Mastering Linux commands (htop, netstat), database optimization (EXPLAIN), and cloud tools (AWS CLI) ensures robust architecture. Security checks (nmap, ufw) and Windows diagnostics (Get-Service) further solidify system reliability.