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System Design · Concept

TTL

TTL sets the maximum time a cached query result may stay in the cache before it is refreshed. It limits how long the result can remain stale.

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  • Cache-aside
  • Write-through
  • Write-behind (write-back)
  • Refresh ahead
  • Cache Consistency patterns

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