________ is a predicate that we expect the database to always satisfy Reason Mandate Assertion Verify

The correct answer is Assertion.

In database terminology, an assertion is a condition that the database must always satisfy. Assertions are used to validate the correctness of data within the database and ensure that it abides by specific rules and constraints. For example, if a database is designed to store information about students, an assertion may require that the age of each student be greater than zero or that a unique student ID must be maintained for each entry.

Assertions can enforce business rules and integrity constraints within the database and are crucial for maintaining data quality. When assertions are defined, the database management system checks these conditions during operations like insertions, updates, or deletions to prevent invalid data from entering the system. If an operation violates an assertion, it would be rejected, thereby preserving the integrity and reliability of the database.