Which of the following options does NOT primarily ensure data integrity for a data warehouse?

In the context of ensuring data integrity for a data warehouse, valid daily backups primarily focus on data availability and recovery rather than directly ensuring the integrity of the data itself. Backups are crucial for protecting against data loss; they enable restoration of data in case of failure or corruption. However, merely having backups does not check or validate the correctness or accuracy of the data stored in the data warehouse.

On the other hand, read-only restrictions on data play a significant role in maintaining data integrity by preventing unauthorized alterations. Change management procedures ensure that any changes made to data follow a controlled and documented process, thereby enhancing integrity by reducing risks of unauthorized or erroneous updates. Additionally, maintaining a data dictionary is essential for data integrity as it defines the structure and format of the data, ensuring consistency and clarity across the data warehouse.

Consequently, while validated daily backups are essential for data protection and recovery, they do not primarily focus on guaranteeing the quality or correctness of data, which is why this option is considered not primarily ensuring data integrity.