Grokking System Design Fundamentals
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Cache Invalidation
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Cache Invalidation Strategies

While caching can significantly improve performance, we must ensure that the data in the cache is still correct—otherwise, we serve out-of-date (stale) information. This is where cache invalidation comes in.

  1. Ensure Data Freshness
    • When the underlying data changes—say a product’s price updates in your database—you must mark or remove the old (cached) data so users don’t see stale information. This process is called “cache invalidation.”

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