Task 3: Use Data Stores in Application Development DVA-C02 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   A developer needs to retrieve all orders for a specific customer ID from a DynamoDB table. Which operation is the most efficient?

   • AGetItem with the customer ID
   • BScan with a filter expression
   • CBatchGetItem with multiple customer IDs
   • DQuery on the customer ID partition key
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   An application reads a user's profile immediately after an update. Which read consistency model should be used to ensure the update is visible?

   • AStrongly consistent read
   • BRead after write
   • CEventually consistent read
   • DTransactional read
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   Why does using a high-cardinality partition key in DynamoDB improve write performance?

   • AIt reduces the number of partitions in the table
   • BIt allows DynamoDB to use a sort key for additional filtering
   • CIt spreads write traffic evenly across multiple partitions
   • DIt ensures all writes go to a single partition for faster processing
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   A developer stores a Java object as a JSON string in Amazon S3. What is the process of converting the JSON string back into a Java object called?

   • AParsing
   • BDeserialization
   • CSerialization
   • DCompilation
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   Which AWS service is best suited for full-text search and log analytics?

   • AAmazon DynamoDB
   • BAmazon RDS
   • CAmazon OpenSearch Service
   • DAmazon ElastiCache
   Reveal Solution Discussion Select an answer first