Tutorials System Design Tutorial
Caching Optimization Techniques — Complete Guide
Caching Optimization Techniques — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of System Design Tutorial on Toolliyo Academy.
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System Design Tutorial · Lesson 83 of 100
Caching Optimization Techniques
Basics ✓ → Scale ✓ → Interview
Interview · 3 — Case studies · ~10 min · Module 9: Performance and Optimization
What is this?
Caching optimization raises hit ratio, cuts stampedes, and sizes TTLs/memory for real access patterns.
Why should you care?
A ShopNest cache that misses constantly is just another network hop.
See it live — copy this example
Sketch the architecture on paper. These lessons focus on concepts and trade-offs.
Hit ratio target: >90% for PDP keys
Stampede: singleflight/lock on miss
TTL: jittered 45–75s
Negative cache: short TTL for missing SKUs
Warm: top 1k SKUs after deployRun Example »
This lesson uses terminal or setup steps. Run commands on your computer — the live editor appears on coding lessons.
What happened?
- Measure hit ratio.
- Prevent thundering herds.
- Jitter TTLs.
- Negative caches stop repeated DB misses for bad ids.
Practice next
- Dashboard ShopNest cache hit ratio.
- Add singleflight on product miss.
- Jitter TTLs.
- Separate TTLs for price vs images.
- Cap memory with LRU eviction policy clarity.
Remember
Optimize for hits. Stop stampedes. Warm + jitter.
PDP hit ratio climb
ShopNest adds singleflight + warm.
Outcome: DB QPS drops during traffic spikes.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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