Where/when does the object impedence mismatch occur?

Question

When people talk about object impedence mismatch, where does the mismatch happen? What can't a database interpret from an object model?

Thanks

Answer 1

Usually because Objects can inherit methods and properties from other Objects and in a relationship database there is no equivalent.

See the following for more information:

http://en.wikipedia.org/wiki/Object-relational_impedance_mismatch