Windchill System Administrator's Guide

proprietary data formats. The following figure illustrates ORDBMS management
of structured and unstructured attributes.
Structured data is stored using normal relational techniques (tables), and
unstructured data is stored as objects. Storing file content in the database
obviously results in large databases and would cause performance problems with
traditional RDBMS technology. However, new ORDBMS technologies (Oracle,
for example) are designed to enable this approach.
The runtime architecture for persistence is based on the CORBA model, as shown
in the following figure. Every object that implements the persistable interface is
assigned a persistence identifier. The PersistenceManager interface identifies the
set of methods that applications use to manage the persistent state of their business
Windchill Runtime Environment A-19