Queries for objects can return unexpected results.
Symptoms
When you query for one or more objects that reside in
an object store with Oracle configured as the database engine, the
query returns unexpected results.
Causes
Queries can return unexpected results if string-valued properties,
such as document title or folder name, are empty.
Resolving the problem
Make sure that all string-valued properties have a value
other than an empty string (""). For more information on how the Oracle
database handles empty strings, see
Database Engine Differences.