Answer
Use opcode cache for compilation, APCu as local memory cache for microsecond access, and Redis or Memcached as distributed cache. Multi-layer caching minimizes DB hits and achieves very high cache-hit ratios.
Quick Answer
Layered caching strategy: L1 in-process cache (APCu) for ultra-hot data, L2 Redis for shared app-level cache, L3 CDN for HTTP responses. Cache at multiple granularities: full page, fragment, entity. Use cache tags for group invalidation. Set appropriate TTLs per data type. Implement cache warming on deploy. Use stale-while-revalidate pattern to avoid cache stampedes on expiry.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ