Clusters are groups of one or more tables physically stores together to share common columns and are often used together.
An integrity constraint is a declarative way to define a business rule for a column of a table.
An Extent is a specific number of contiguous data blocks, obtained in a single allocation, and used to store a specific type of information.
- Query Record Groups
- NonQuery Record Groups
- State Record Groups
Record group column names cannot exceed 30 characters.