Which characteristic applies to DynamoDB’s conditional writes?

DynamoDB's conditional writes allow developers to specify conditions that must be met for write operations such as PutItem and DeleteItem to succeed. This feature is particularly useful for implementing optimistic concurrency control, as it allows you to prevent overwriting data or deleting items based on certain criteria.

With conditional writes, you can define expressions that determine whether the requested action should take place. For example, you might want to ensure that an item is only updated if its current version matches your expected version, or you might want to delete an item only if it exists in the database.

This flexibility in specifying conditions on both PutItem (to add or update items) and DeleteItem (to remove items) is a key aspect of DynamoDB that enhances data integrity and consistency across distributed systems. The ability to perform conditional checks before mutations is particularly valuable in scenarios where multiple clients might be attempting to modify the same piece of data concurrently.

In this context, while the other options suggest limitations or incorrect applications of DynamoDB's capabilities regarding conditional writes, the correct answer highlights a fundamental aspect of how DynamoDB provides powerful data manipulation features while ensuring data consistency through conditional expressions.