Given a DynamoDB table with primary key "UserID", what happens if you try to add two items with the same UserID but different attributes?

medium📝 service behavior Q13 of 15

AWS - DynamoDB

Given a DynamoDB table with primary key "UserID", what happens if you try to add two items with the same UserID but different attributes?

ABoth items are stored separately

BThe table creates a duplicate primary key

CAn error is thrown and no item is added

DThe second item overwrites the first item

Step-by-Step Solution

Solution:

Step 1: Understand primary key uniqueness
In DynamoDB, the primary key must be unique for each item in the table.
Step 2: Effect of duplicate primary key
If you add an item with an existing primary key, it replaces the old item with the new one.
Final Answer:
The second item overwrites the first item -> Option D
Quick Check:
Duplicate key = overwrite existing item [OK]

Quick Trick: Duplicate primary keys overwrite existing items [OK]

Common Mistakes:

MISTAKES

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