On-demand backups in DynamoDB - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ query_result

intermediate

What is the output of the backup status query?

You run the following AWS CLI command to list backups for a DynamoDB table named Users.

aws dynamodb list-backups --table-name Users

What key in the JSON output tells you the status of each backup?

A "BackupArn"

B "BackupCreationDateTime"

C "BackupStatus"

D "BackupName"

💡 Hint

Look for the key that describes if the backup is completed or in progress.

The key "BackupStatus" in the output JSON shows the status of each backup, such as 'CREATING' or 'AVAILABLE'.

🧠 Conceptual

intermediate

Which statement about on-demand backups is true?

Consider these statements about DynamoDB on-demand backups. Which one is correct?

A On-demand backups can be created without impacting table performance.

B On-demand backups automatically delete after 7 days.

C On-demand backups require the table to be in read-only mode.

D On-demand backups cannot be created for global tables.

💡 Hint

Think about how backups affect normal table operations.

On-demand backups in DynamoDB are designed to be created without affecting the table's availability or performance.

📝 Syntax

advanced

Which AWS CLI command correctly creates an on-demand backup?

You want to create an on-demand backup of a DynamoDB table named Orders. Which command is correct?

A aws dynamodb backup-table --table Orders --name OrdersBackup1

B aws dynamodb make-backup --table-name Orders --backup-name OrdersBackup1

C aws dynamodb start-backup --table Orders --backup OrdersBackup1

D aws dynamodb create-backup --table-name Orders --backup-name OrdersBackup1

💡 Hint

Check the exact AWS CLI command syntax for creating backups.

The correct AWS CLI command to create an on-demand backup is 'create-backup' with parameters --table-name and --backup-name.

❓ optimization

advanced

How to minimize costs when using on-demand backups?

You have many on-demand backups for a DynamoDB table. Which practice helps reduce storage costs?

A Delete old backups that are no longer needed.

B Create backups more frequently to have more restore points.

C Keep all backups indefinitely for safety.

D Use on-demand backups only during peak hours.

💡 Hint

Think about how backup storage costs accumulate.

Deleting old backups that are no longer needed helps reduce storage costs because backups consume storage space billed by AWS.

🔧 Debug

expert

Why does this backup creation command fail?

You run this command:

aws dynamodb create-backup --table-name Customers --backup-name

But it returns an error. What is the cause?

A The table name 'Customers' does not exist.

B The --backup-name parameter is missing a value.

C The AWS CLI version does not support create-backup.

D The command requires --region parameter.

💡 Hint

Check if all required parameters have values.

The error occurs because the --backup-name parameter is given without a value, which is required.