Cache and Raid performance. One of the key limitations of spinning disk hardware is the use of a physical reading armature and the time this takes to move across the surface of a diskâs platter to the required data blocks.
Constraints are part of a database schema definition. A constraint is usually associated with a table and is created with a CREATE CONSTRAINT or CREATE ASSERTION SQL statement. They define certain properties that data in a database must comply with.
A constraint is a statement of restriction that modifies a requirement or set of requirements by limiting the range of acceptable solutions. While this may initially be perceived as a drawback to the development of a project, constraints in many ways have a powerful way of helping projects work smoothly or reduce the risks of catastrophic failure. Constraints appear across all levels of the requirements hierarchy (business, functional, system, user).