Homework Help: Questions and Answers: As a Senior Software Developer for a major pharmaceutical company you have been tasked by your lead to develop a new module that involves querying a DynamoDB table with multiple Partition Key values simultaneously and saving the result in CSV format on S3. What method will you employ to accomplish this task?
A) BatchGetltem
B) Scan
C) Query
D) Getltem
Answer:
First, let’s understand the requirements:
- We need to query a DynamoDB table
- We need to use multiple Partition Key values simultaneously
- The result needs to be saved in CSV format on S3
To solve this problem, let’s evaluate each option to determine the most suitable method for querying a DynamoDB table with multiple partition key values and saving the result in CSV format on S3.
Given Options: Step by Step Answering
A) BatchGetItem
- BatchGetItem is used to retrieve multiple items from one or more tables. It can handle multiple partition key values but has a limit of 100 items or 16 MB of data per request.
- This method is appropriate for retrieving multiple items by their partition keys, making it a good choice for the requirement to query multiple partition key values simultaneously.
B) Scan
- Scan reads every item in the table and returns all data attributes by default. It’s used when you need to retrieve all items, not specific ones.
- This method is inefficient for querying specific partition key values as it reads the entire table, which can be time-consuming and costly.
C) Query
- Query is used to find items based on primary key attribute values. It is efficient for querying items that share a common partition key.
- This method is suitable if you are querying items with a specific partition key but not for querying multiple different partition key values simultaneously.
D) GetItem
- GetItem retrieves a single item from a table by its primary key.
- This method is not suitable for querying multiple partition key values simultaneously as it only retrieves one item per request.
Final Answer
Based on the above analysis, the most appropriate method for querying a DynamoDB table with multiple partition key values simultaneously is:
a) BatchGetItem
This method allows you to retrieve multiple items in a single request using their partition keys, which aligns with the requirement of querying multiple partition key values.
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