Caching Strategy

Demo

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---
name: Caching Strategy
description: Design correct multi-layer caching.
---

# Caching Strategy

Add caching where it helps, and keep it correct under invalidation and load.

## Layers

1. Browser/CDN: cache static and cacheable responses near the user.
2. Application: in-memory or Redis for computed results and hot objects.
3. Database: query cache, materialized views, read replicas.

Cache as close to the consumer as correctness allows.

## Patterns

- Cache-aside (lazy): on miss, load from source, store, return. Most common.
- Read-through / write-through: cache sits inline with the store.
- Write-behind: buffer writes, flush async (risk of loss).

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