Which Delete Rule property does not ensure referential integrity?

The Delete Rule property that does not ensure referential integrity is associated with the option that signifies the ability to execute a deletion without enforcing constraints on related data. In the context of database management and data relationships, maintaining referential integrity is crucial for ensuring that relationships between data entities remain valid and consistent.

When the delete rule is set to "Ignore," it allows a record to be deleted without checking for related records. This means that even if there are other entities that rely on this record, the deletion will proceed regardless of its impact. Consequently, it does not enforce the necessary checks that would prevent orphaned records or inconsistency in the database.

In contrast, properties such as "Protect," "Delete," and "Maintain" involve some level of enforcement regarding how deletions are handled in relation to other entities. For example, "Protect" may prevent deletion if there are existing references, while "Maintain" might require that related records are addressed before a deletion occurs.

Understanding these options is key in designing databases and ensuring that operations on data maintain integrity and coherence throughout the data model.