Partitioning and LOB Data

Unstructured data (such as images and documents) which is stored in a LOB column in a database can also be partitioned. When a table is partitioned, all of the columns reside in the tablespace for that partition, except LOB columns, which can be stored in their own tablespace.

This technique is very useful when a table consists of large LOBs because they can be stored separately from the main data. This can be beneficial if the main data is being frequently updated but the LOB data is not. For example, an employee record may contain a photo which is unlikely to change frequently. However, the employee personnel details (such as address, department, manager, and so on) could change. This approach also means that you can use less expensive storage for storing the LOB data and more expensive, faster storage can be used for the employee record.