BatchGetItem in DynamoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the table name in the BatchGetItem request.

DynamoDB

{
  "RequestItems": {
    "[1]": {
      "Keys": [
        { "UserId": { "S": "123" } },
        { "UserId": { "S": "456" } }
      ]
    }
  }
}

Drag options to blanks, or click blank then click option'

AProducts

BOrders

CUsers

DInventory

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong table name that does not exist.

Forgetting to put the table name as a key.

The table name must be specified as the key in the RequestItems object. Here, "Users" is the correct table name.

2fill in blank

medium

Complete the code to specify the key attribute name for the BatchGetItem request.

DynamoDB

{
  "RequestItems": {
    "Users": {
      "Keys": [
        { "[1]": { "S": "123" } },
        { "UserId": { "S": "456" } }
      ]
    }
  }
}

Drag options to blanks, or click blank then click option'

AOrderId

BUserId

CProductId

DInventoryId

Attempts:

3 left

💡 Hint

Common Mistakes

Using a key attribute name that does not exist in the table.

Mixing key names from different tables.

The key attribute name must match the primary key of the table. Here, "UserId" is the correct key for the Users table.

3fill in blank

hard

Fix the error in the BatchGetItem request by completing the missing attribute type.

DynamoDB

{
  "RequestItems": {
    "Users": {
      "Keys": [
        { "UserId": { "[1]": "123" } },
        { "UserId": { "S": "456" } }
      ]
    }
  }
}

Drag options to blanks, or click blank then click option'

AB

BN

CBOOL

DS

Attempts:

3 left

💡 Hint

Common Mistakes

Using N for string values causes errors.

Omitting the attribute type entirely.

The attribute type for a string value in DynamoDB is "S". This must be used to specify string keys.

4fill in blank

hard

Fill both blanks to specify the ProjectionExpression and ConsistentRead options in BatchGetItem.

DynamoDB

{
  "RequestItems": {
    "Users": {
      "Keys": [
        { "UserId": { "S": "123" } }
      ],
      "[1]": "UserName, Email",
      "[2]": true
    }
  }
}

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AProjectionExpression

BConsistentRead

CFilterExpression

DReturnConsumedCapacity

Attempts:

3 left

💡 Hint

Common Mistakes

Using FilterExpression instead of ProjectionExpression.

Setting ConsistentRead to a string instead of boolean.

ProjectionExpression specifies which attributes to return. ConsistentRead set to true ensures strongly consistent reads.

5fill in blank

hard

Fill all three blanks to complete the BatchGetItem request with multiple tables and keys.

DynamoDB

{
  "RequestItems": {
    "Users": {
      "Keys": [
        { "UserId": { "S": "123" } },
        { "UserId": { "S": "456" } }
      ]
    },
    "[1]": {
      "Keys": [
        { "[2]": { "S": "789" } },
        { "OrderId": { "S": "101" } }
      ],
      "[3]": false
    }
  }
}

Drag options to blanks, or click blank then click option'

AOrders

BOrderId

CConsistentRead

DUsers

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong table name for the second table.

Mixing key attribute names between tables.

Setting ConsistentRead to a string instead of boolean.

The second table is "Orders". Its key attribute is "OrderId". The ConsistentRead option is set to false for eventually consistent reads.