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System Design · Concept

Cache Invalidation

Cache invalidation keeps cached values consistent with the database or other source of truth. It requires deciding when to remove or update entries after the underlying data changes.

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  • Cache-aside
  • Caching at the database query level
  • Caching at the object level
  • Application caching
  • Least recently used (LRU)

Source: system-design-primer/README.md at master · donnemartin/system-design-primer · GitHub. Checked 2026-11-03.