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.
Integrity constraints can be defined on the columns of a table to enforce the business rules of your database automatically. Before creating a Table you also have to decide what type of data each column can contain. This is known as datatype. Lets Discuss what datatypes are available in Oracle.