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.
In T-SQL, there are really two kinds of column-level defaults: default constraints and bound defaults. &#9;Default constraints are ANSI-standard constraints you can assign to a column either with the CREATE TABLE or ALTER TABLE statements.Although default constraints have names, the CREATE TABLE statement doesn't let you do ityou have to let SQL Server construct a name.hen add whether the column should be NULL or not: Finally, get the column default constraint value from the view: When you use the stored procedure against the preceding table, like so: the output of the stored procedure is. &#9;The stored procedure inserts tabs but can't make the columns line up precisely.