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AZ-305 · Application architecture

Practice question 297 of 400 · medium

An application misses its catalog key in a distributed cache. It uses cache-aside. What should happen next?

Choose the single best answer.

  1. A.Treat the miss as proof that the database row does not exist
  2. B.Write a blank cached value permanently without reading the source
  3. C.Move the authoritative database into process memory
  4. D.Read the authoritative database, then cache the result with a suitable TTL
Show the answer and explanation

✓ Correct answer

  • Read the authoritative database, then cache the result with a suitable TTL

Cache-aside loads from the source on a miss and caches reusable data. A miss only describes cache state, a permanent blank can hide valid source data, and process memory is not a suitable durable authoritative replacement. Source guide: PDF page(s) 53.

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