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Why does DAX improve read performance without increasing DynamoDB read capacity units?

hard🧠 Conceptual Q10 of 15
DynamoDB - Cost Optimization and Monitoring
Why does DAX improve read performance without increasing DynamoDB read capacity units?
ABecause DAX batches multiple read requests into one
BBecause DAX serves cached data from memory, reducing direct DynamoDB calls
CBecause DAX automatically scales DynamoDB tables in the background
DBecause DAX compresses data to reduce network usage
Step-by-Step Solution
Solution:

  1. Step 1: Understand DAX caching mechanism

    DAX stores frequently read data in memory, so reads do not always hit DynamoDB.

  2. Step 2: Eliminate incorrect options

    DAX does not compress data, scale tables, or batch reads inherently.

  3. Final Answer:

    Because DAX serves cached data from memory, reducing direct DynamoDB calls -> Option B

  4. Quick Check:

    DAX reduces DynamoDB calls by caching in memory [OK]
Quick Trick: DAX caches in memory to reduce DynamoDB read calls [OK]
Common Mistakes:
MISTAKES
  • Thinking DAX compresses data
  • Assuming DAX auto-scales tables
  • Believing DAX batches reads automatically

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