DynamoDB Transactions and Locking
Explore how DynamoDB inherently supports locking mechanisms to maintain data consistency and atomicity.
DynamoDB provides the TransactWriteItems and TransactGetItems API to enable atomic operations on multiple items across one or more tables. Each transaction operation succeeds or fails together, maintaining ACID properties (atomicity, consistency, isolation, durability).
For example, when a user publishes a new post, you need to create the new post in the UserPosts table and update the Users table to increment the PostsCount for that user. Both operations must succeed or fail together to maintain system integrity.
The TransactWriteItems and BatchWriteItem
TransactWriteItems is an atomic batch operation. It allows up to 25 actions in a single request, targeting one or more tables. If any action within the transaction fails because of a condition failure, throughput issue, or internal error, none of the actions are applied.
Another operation for writing multiple items to a DynamoDB table is BatchWriteItem, which allows up to 25 put or delete operations in a single call. It’s efficient for bulk write scenarios where atomicity is not required, such as importing data or periodically syncing items. ...