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A production system needs to handle millions of users with minimal downtime. Which combination of advanced concepts best supports this goal?

hard๐Ÿ“ Trade-off Q15 of Q15
LLD - Advanced LLD Concepts

A production system needs to handle millions of users with minimal downtime. Which combination of advanced concepts best supports this goal?

ALoad balancing, caching, and failover mechanisms
BSingle server deployment and manual backups
CNo caching and direct database access
DStatic content only with no scaling
Step-by-Step Solution
Solution:
  1. Step 1: Identify key needs for high user load and uptime

    Handling millions of users requires spreading load, fast responses, and recovery from failures.
  2. Step 2: Match advanced concepts to these needs

    Load balancing distributes traffic, caching speeds responses, and failover ensures system stays up if parts fail.
  3. Final Answer:

    Load balancing, caching, and failover mechanisms -> Option A
  4. Quick Check:

    High scale + uptime = load balancing + caching + failover [OK]
Quick Trick: Combine load balancing, caching, and failover for scale and uptime [OK]
Common Mistakes:
MISTAKES
  • Choosing single server which can't scale
  • Ignoring caching benefits
  • Overlooking failover for downtime prevention

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