DEA-C01 Data Operations and Support Practice Question

Exhibit

Refer to the exhibit.

CloudFormation template snippet:
"MyTable": {
  "Type": "AWS::DynamoDB::Table",
  "Properties": {
    "TableName": "Orders",
    "AttributeDefinitions": [
      {"AttributeName": "OrderID", "AttributeType": "S"}
    ],
    "KeySchema": [
      {"AttributeName": "OrderID", "KeyType": "HASH"}
    ],
    "ProvisionedThroughput": {
      "ReadCapacityUnits": 5,
      "WriteCapacityUnits": 5
    }
  }
}

A data engineer creates an Amazon DynamoDB table using the CloudFormation snippet in the exhibit. The application writes 200 items per second to the table. The engineer notices that many write requests are being throttled. What is the MOST likely reason?

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

✓

The provisioned write capacity is too low for the application's write rate.

The table is provisioned with only 5 write capacity units, which allows 5 writes per second (each write up to 1 KB). With 200 writes per second, the table is severely under-provisioned. Option A is incorrect because the key schema is fine for a primary key. Option B is incorrect because the attribute type is correct. Option C is incorrect because the table name is valid.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
The table does not have a sort key, causing hot partitions.
Why it's wrong here
A sort key is optional; hot partitions would cause throttling but the main issue is insufficient throughput.
✗
The attribute type for OrderID should be numeric for better performance.
Why it's wrong here
String type is fine for a hash key.
✗
The table name 'Orders' conflicts with an existing table.
Why it's wrong here
CloudFormation would fail if table already exists.
✓
The provisioned write capacity is too low for the application's write rate.
Why this is correct
5 WCU allows only 5 writes per second (1 KB each).

Go deeper

DEA-C01 Data Operations and Support Practice Question

Exhibit

Why each option matters

Option-by-option breakdown

Related to this question