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Multiple ChoiceBeginner 45s

Negative caching

What problem does negative caching (caching the absence of a value) primarily solve?
Options
  1. 1It ensures the database never sees read traffic at all
  2. 2It encrypts negative cache entries at rest on the storage disk
  3. 3It prevents repeated expensive lookups for keys that do not exist
  4. 4It removes the need for TTLs by storing absent keys forever
system-designcaching

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