DBS-C01 Workload-Specific Database Design Practice Question
Exhibit
Refer to the exhibit.
```json
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": ["dynamodb:GetItem", "dynamodb:PutItem"],
"Resource": "arn:aws:dynamodb:us-east-1:123456789012:table/Orders",
"Condition": {
"ForAllValues:StringEquals": {
"dynamodb:LeadingKeys": ["customer_123"]
}
}
}
]
}
```An IAM policy is attached to a user to restrict access to a DynamoDB table. What does this policy allow the user to do?
⚠ Common exam trap
It's easy for candidates to assume a policy restricting access to a specific partition key still allows a full table Scan, but DynamoDB's fine-grained access control with `dynamodb:LeadingKeys` explicitly denies any operation that does not specify the allowed partition key, including Scans.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Read and write items only where the partition key equals 'customer_123'
The IAM policy uses a condition key `dynamodb:LeadingKeys` with a condition operator `ForAllValues:StringEquals` to restrict access to items where the partition key equals 'customer_123'. This allows the user to perform read and write operations only on items matching that specific partition key value, enforcing fine-grained access control at the item level.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Read and write items only where the partition key equals 'customer_123'
Why this is correct
The condition restricts operations to items with LeadingKeys 'customer_123'.
- ✗
Read and write any item in the Orders table
Why it's wrong here
The condition restricts access to a specific partition key value.
- ✗
Scan the entire Orders table
Why it's wrong here
Scan is not allowed because the policy only allows GetItem and PutItem.
- ✗
Perform all DynamoDB actions on the Orders table
Why it's wrong here
Only GetItem and PutItem are allowed.
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