An application uses the GetItem operation to read data from a DynamoDB table.
What strategy can be used to reduce the size of the read operations and increase read efficiency?
Click on the arrows to vote for the correct answer
A. B. C. D.Answer: D.
Option A is incorrect because filter expression can be used with Scan operations to filter the results returned by the scan operation.
It cannot be used to make GetItem operations more efficient.
Option B is incorrect because Pagination is used with Scan operations to divide the result set of the Scan operation into pages.
It cannot be used to make GetItem operations more efficient.
Option C is incorrect because Parallel Scans allows multi-threaded applications to perform Scan operations quicker.
It cannot be used to make GetItem operations more efficient.
Option D is CORRECT because Projection Expressions can be used to limit the attributes returned by the GetItem operation and thus reduce the size of the read operation.
Reference:
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.ProjectionExpressions.htmlDynamoDB is a NoSQL database service provided by AWS that allows users to store and retrieve data. The GetItem operation is used to read data from a DynamoDB table using a primary key. However, there are strategies that can be used to reduce the size of read operations and increase read efficiency. Let's examine each answer choice:
A. Use Filter Expression: Filter Expression is a feature of DynamoDB that can be used to filter out data that does not meet a specified condition. While this can reduce the size of read operations, it may not be the best strategy to increase read efficiency as the Filter Expression still scans the entire table before filtering out the data.
B. Use Pagination: Pagination is a feature that allows users to read data in smaller chunks, making it more efficient to read large amounts of data. However, this strategy does not reduce the size of read operations, it only makes them more manageable by breaking them down into smaller parts.
C. Use Parallel Scan: Parallel Scan is a feature that allows users to scan multiple segments of a table simultaneously, reducing the time it takes to scan large tables. However, this strategy does not work with the GetItem operation as it is specifically used to retrieve data using a primary key, not scan an entire table.
D. Use Projection Expression: Projection Expression is a feature that allows users to retrieve specific attributes from a table, rather than retrieving the entire item. This can significantly reduce the size of read operations and increase read efficiency, especially when only a few attributes are needed. Using Projection Expression with the GetItem operation can help to minimize the amount of data being retrieved and improve overall read performance.
Therefore, the correct answer to this question is D. Use Projection Expression.