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What is the purpose of the LastEvaluatedKey in DynamoDB SDK pagination?

easy🧠 Conceptual Q1 of 15
DynamoDB - with AWS SDK
What is the purpose of the LastEvaluatedKey in DynamoDB SDK pagination?
AIt marks the last item returned to fetch the next page
BIt limits the number of items returned in a query
CIt sorts the items in ascending order
DIt filters items based on a condition
Step-by-Step Solution
Solution:

  1. Step 1: Understand the role of LastEvaluatedKey

    The LastEvaluatedKey is used to mark the last item returned in a query or scan operation.

  2. Step 2: Use LastEvaluatedKey for pagination

    It is passed back to the query or scan to continue fetching the next set of results from where the last call ended.

  3. Final Answer:

    It marks the last item returned to fetch the next page -> Option A

  4. Quick Check:

    LastEvaluatedKey = Marks last item for next page [OK]
Quick Trick: LastEvaluatedKey tells where to continue next page [OK]
Common Mistakes:
MISTAKES
  • Confusing LastEvaluatedKey with Limit parameter
  • Thinking it sorts or filters results
  • Ignoring it when paginating

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