shared ddb

It seems like you are referring to "shared DDB," which typically stands for "shared distributed database." A shared distributed database is designed to allow multiple users or applications to access and manipulate the database concurrently over a network. If you have a specific context in mind, such as technology related to shared distributed databases, something related to Amazon DynamoDB (which could be abbreviated as DDB), or another database system, please provide more details so I can offer a more precise and relevant response!