What does a Global Secondary Index (GSI) in DynamoDB allow you to do?
a) Modify the primary key of a table
b) Query data using an alternative key
c) Automatically back up your data
d) Archive old data
Answer:
b) Query data using an alternative key
Explanation:
A Global Secondary Index (GSI) allows you to query data using an alternative partition and/or sort key different from the primary key of the base table.