AWS CLI for DynamoDB - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ service_behavior

intermediate

What is the output of this AWS CLI command?

You run this command to list all tables in your DynamoDB account:

aws dynamodb list-tables --region us-east-1

What will the command output if you have exactly two tables named Users and Orders?

DynamoDB

aws dynamodb list-tables --region us-east-1

A {"TableNames": ["Users", "Orders"]}

B {"Tables": ["Users", "Orders"]}

C {"TableList": ["Users", "Orders"]}

D }]"sredrO" ,"sresU"[ :"semaNelbaT"{

💡 Hint

Look for the exact key name that AWS CLI uses to list tables.

The AWS CLI for DynamoDB returns a JSON object with the key 'TableNames' containing a list of table names.

❓ Configuration

intermediate

Which AWS CLI command creates a DynamoDB table with a primary key named 'Id' of type string?

You want to create a DynamoDB table named Products with a simple primary key called Id of type string. Which command will do this correctly?

A aws dynamodb create-table --table-name Products --attribute-definitions AttributeName=Id,AttributeType=S --key-schema AttributeName=Id,KeyType=RANGE --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5

B aws dynamodb create-table --table-name Products --attribute-definitions AttributeName=Id,AttributeType=N --key-schema AttributeName=Id,KeyType=HASH --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5

C aws dynamodb create-table --table-name Products --attribute-definitions AttributeName=Id,AttributeType=S --key-schema AttributeName=Id,KeyType=HASH --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5

D aws dynamodb create-table --table-name Products --attribute-definitions AttributeName=Id,AttributeType=S --key-schema AttributeName=Id,KeyType=HASH

💡 Hint

The primary key must be of type HASH and attribute type S for string.

Option C correctly defines the attribute as string (S), sets the key type as HASH, and includes required provisioned throughput.

❓ security

advanced

What error occurs if you try to delete a DynamoDB table that does not exist using AWS CLI?

You run this command:

aws dynamodb delete-table --table-name NonExistentTable

What error message will AWS CLI return?

A An error with code ValidationException indicating invalid table name

B An error with code AccessDeniedException indicating you lack permissions

C No error; the command succeeds silently

D An error with code ResourceNotFoundException indicating the table does not exist

💡 Hint

Deleting a non-existing resource usually returns a 'not found' error.

AWS DynamoDB returns ResourceNotFoundException when trying to delete a table that does not exist.

❓ Architecture

advanced

Which AWS CLI command correctly updates the provisioned throughput of a DynamoDB table named 'Orders' to 10 read and 5 write units?

You want to increase the read capacity units to 10 and write capacity units to 5 for the 'Orders' table. Which command is correct?

A aws dynamodb update-table --table-name Orders --provisioned-throughput ReadCapacityUnits=10,WriteCapacityUnits=5

B aws dynamodb update-table --table-name Orders --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=10

C aws dynamodb update-table --table-name Orders --read-capacity 10 --write-capacity 5

D aws dynamodb update-table --table-name Orders --capacity Read=10,Write=5

💡 Hint

Provisioned throughput requires both read and write capacity units specified in a single option.

Option A uses the correct syntax for updating provisioned throughput with the right values.

🧠 Conceptual

expert

What is the output of this AWS CLI command querying a DynamoDB table?

You run this command to query the 'Users' table for items where 'UserId' equals '123':

aws dynamodb query --table-name Users --key-condition-expression "UserId = :v1" --expression-attribute-values '{":v1":{"S":"123"}}'

Assuming the table has one item with UserId '123' and attribute 'Name' with value 'Alice', what will the output JSON contain?

DynamoDB

aws dynamodb query --table-name Users --key-condition-expression "UserId = :v1" --expression-attribute-values '{":v1":{"S":"123"}}'

A {"Items": [{"UserId": "123", "Name": "Alice"}], "Count": 1}

B {"Items": [{"UserId": {"S": "123"}, "Name": {"S": "Alice"}}], "Count": 1, "ScannedCount": 1}

C {"Results": [{"UserId": {"S": "123"}, "Name": {"S": "Alice"}}], "Count": 1}

D {"Items": [{"UserId": {"N": "123"}, "Name": {"S": "Alice"}}], "Count": 1, "ScannedCount": 1}

💡 Hint

DynamoDB returns attribute values with their types in the output.

Option B correctly shows the attribute values with their types (S for string) and includes Count and ScannedCount keys.