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 constraint violation: 1052 Column 'increment_id' in where clause is ambiguous. up vote 2 down vote favorite. I am trying to create a customer grid module that accesses different table columns from sales_order information such as billing, payment method etc..