Which security measure is most effective in ensuring the integrity of information in a data warehouse?

The most effective security measure for ensuring the integrity of information in a data warehouse is a read-only restriction. This security measure ensures that users can only view the data and cannot alter, delete, or otherwise manipulate it. By limiting access in this way, the integrity of the data is preserved, as unauthorized changes that could lead to corruption or loss of information are effectively prevented.

Implementing a read-only restriction is particularly important in environments like data warehouses where the data serves as a critical source for analytics, reporting, and decision-making. The integrity of this data is paramount, as any inaccuracies introduced by unauthorized alterations can lead to misguided business decisions.

Other measures, while they also play critical roles in data management, do not provide the same level of direct protection against data modification. For example, validated daily backups are essential for data recovery in the event of loss or corruption but do not actively prevent changes to data in real-time. Change management procedures focus on how changes to the data are implemented but do not inherently restrict who can make those changes. Data dictionary maintenance ensures that metadata is accurate but does not directly protect the underlying data's integrity.

Thus, a read-only restriction effectively safeguards the integrity of information by controlling who can modify the data, making it the most suitable