Final answer:
Yes, RCU (Read Capacity Units) in Amazon DynamoDB can be reduced using a ProjectionExpression.
Step-by-step explanation:
Yes, RCU (Read Capacity Units) in Amazon DynamoDB can be reduced using a ProjectionExpression. ProjectionExpression is used to specify the attributes that should be returned in a Query or Scan operation. It allows you to retrieve only the required attributes, reducing the read capacity units consumed.
For example, if you have a table with multiple attributes but only need a subset of those attributes in your query results, you can use ProjectionExpression to specify which attributes to retrieve. This helps to minimize the amount of data read from the database and subsequently reduces the RCU usage.