Partitioned views are used to access data that has been horizontally split, or partitioned, across multiple tables. These tables can be in the same or different databases—or even spread across multiple servers. Partitioning of tables is done to spread the I/O and processing load of large tables across multiple disks or servers.
You combine the tables in a partitioned view by using a
UNION ALL statement that causes the data from the separate tables to appear as if they were one table. These separate tables are referred to as member tables or base tables. The member tables in a
SELECT statement of the view must all be structured in the same way, and the view must adhere to the following restrictions:
All the columns from the ...