On-demand backups in DynamoDB - Step-by-Step Execution

Concept Flow - On-demand backups

Start Backup Request

↓

Check Table Exists?

No→Error: Table Not Found

Yes↓

Create Backup

↓

Backup Status: CREATING

↓

Backup Status: AVAILABLE

↓

Backup Ready for Use

The flow starts with a backup request, checks if the table exists, creates the backup, waits for it to become available, then the backup is ready to use.

Execution Sample

DynamoDB

aws dynamodb create-backup --table-name Music --backup-name MusicBackup1

This command creates an on-demand backup of the 'Music' table named 'MusicBackup1'.

Execution Table

Step	Action	Input	Output	Status
1	Receive backup request	Table: Music, BackupName: MusicBackup1	Request accepted	Pending
2	Check if table exists	Table: Music	Table found	Pending
3	Start backup creation	Table: Music	Backup creation started	CREATING
4	Wait for backup completion	Backup: MusicBackup1	Backup status updated	CREATING
5	Backup creation complete	Backup: MusicBackup1	Backup available	AVAILABLE
6	Backup ready	Backup: MusicBackup1	Backup can be used	AVAILABLE

💡 Backup status is AVAILABLE, so the on-demand backup is complete and ready.

Variable Tracker

Variable	Start	After Step 2	After Step 3	After Step 5	Final
TableExists	Unknown	True	True	True	True
BackupStatus	None	None	CREATING	AVAILABLE	AVAILABLE

Key Moments - 3 Insights

Why do we check if the table exists before creating a backup?

Because if the table does not exist (see Step 2 in execution_table), the backup cannot be created and the process stops with an error.

What does the backup status 'CREATING' mean?

It means the backup process has started but is not finished yet (see Steps 3 and 4). The backup is not usable until the status changes to 'AVAILABLE'.

When is the backup ready to use?

When the backup status is 'AVAILABLE' (see Step 5 and 6), the backup is complete and can be restored or copied.

Visual Quiz - 3 Questions

Look at the execution_table, what is the backup status after Step 3?

A CREATING

B AVAILABLE

C PENDING

D FAILED

💡 Hint

Check the 'Status' column in the row for Step 3 in the execution_table.

At which step does the backup become ready for use?

A Step 5

B Step 6

C Step 4

D Step 2

💡 Hint

Look at the 'Action' and 'Status' columns in the execution_table for when the backup is 'AVAILABLE' and ready.

If the table does not exist, what happens according to the concept_flow?

A Backup is created anyway

B Backup status is AVAILABLE

C Error: Table Not Found

D Backup creation starts but fails later

💡 Hint

Refer to the decision after 'Check Table Exists?' in the concept_flow diagram.

Concept Snapshot

On-demand backups in DynamoDB:
- Use create-backup command with table and backup names.
- System checks if the table exists first.
- Backup status moves from CREATING to AVAILABLE.
- Backup is ready to use only when AVAILABLE.
- Errors occur if table not found.

Full Transcript

On-demand backups in DynamoDB start when you request a backup for a specific table. The system first checks if the table exists. If it does not, an error stops the process. If the table exists, the backup creation begins and the status is 'CREATING'. Once the backup is complete, the status changes to 'AVAILABLE', meaning the backup is ready to use. This process ensures your data is safely saved and can be restored later if needed.