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Data Partitioning

Oracle Tips by Burleson Consulting

The Data Warehouse Development Life Cycle

Distributed Oracle Data Warehouses

Data Partitioning

SELECT employee.emp_id, emp_name, phone, salary
FROM employee@denver, employee@phoenix, salary@dallas

Figure 9.4 shows an example of horizontal and vertical partitioning.

Figure 9.4 The two types of data partitioning.

Note that table partitioning is not always used with distributed databases. You may choose to partition a very large fact table according to month to make the indexes easier to manage, while leaving the horizontal partitions within the same schema. However, there are some benefits to distributing tables, and these benefits will be addressed in detail later in this chapter. While vertical and horizontal partitioning are helpful for Oracle data warehouses, both methods suffer from some drawbacks. Because each database continues to maintain two identities--one for the local location and another for the overall federation--response times can vary widely depending on the local demands on the tables. There is also the problem of data dependence. Unlike a replicated distributed database, a failure at any one of the remote nodes makes a part of the overall system unavailable.

This is an excerpt from "High Performance Data Warehousing", copyright 1997.

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