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Library that helps you create and migrate DynamoDB databases

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A library that helps you create and migrate DynamoDB databases.

As performant DynamoDB is, that does come with the trade-off of being inflexible. Changing column names or adding secondary indexes is impossible.
The recommended approach is to create a new table with the desired properties, and migrate the existing data.
This library will help you do just that.


  • Write a migration script
  • Execute the migration script as a step in the build pipeline
  • Add to the migration-script as required

Example Script

from migrator.dynamodb_migrator import Migrator
migrator = Migrator()
@migrator.create(AttributeDefinitions=[{'AttributeName': 'hash_key', 'AttributeType': 'N'}],
                 KeySchema=[{'AttributeName': 'hash_key', 'KeyType': 'HASH'}],
def v1(created_table):
    print("Table created using the kwargs provided")
    print("Note that the keyword-args are passed onto boto as is")

@migrator.add_index(AttributeDefinitions=[{'AttributeName': 'postcode', 'AttributeType': 'S'}],
                    LocalSecondaryIndexes=[{'IndexName': 'string',
                                            'KeySchema': [{'AttributeName': 'customer_nr', 'KeyType': 'HASH'},
                                                          {'AttributeName': 'postcode', 'KeyType': 'RANGE'}],
                                            'Projection': {'ProjectionType': 'ALL'}}])
def v2(created_table):
    print("Created a new table with the new index")
    print("Created a DynamoDB stream that sends all updates to the old table to a custom Lambda-function")
    print("The custom Lambda-function sends all updates to the new table")

def v3(migrate):
    print("About to delete table")
    print("Ensure that all upstream applications point to the new table, before adding this part to the pipeline!")
    print("Table deleted")

@migrator.convert(lambda item -> {'id': translate(})
def v4(migrate):
    print("About to:")
    print(" - Create new table (first_table_v4)")
    print(" - Create a AWS Lambda script that will execute the above lambda, and write the result int he new table")
    print(" - Create DynamoDB Stream on 'first_table' that triggers the new Lambda")
    print(" - Execute a script that automatically updates all existing data")
    print("   (This will trigger all data in 'first_table' to be converted and copied into the new table")
    print("Table with new data is ready to use")


See the examples-folder.

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