There is no good way to migrate MDDBs to V9Cubes.

Here is an excerpt from the SAS migration website (http://support.sas.com/rnd/migration/planning/files/mddb.html):

“There is no automated method to convert Version 8 MDDB code to SAS 9.1 OLAP code. PROC MDDB executes in SAS 9.1. However, it creates a Version 8 MDDB that cannot use the SAS 9.1 features such as the threaded kernel and the improved caching mechanism. To help you rewrite your MDDB code in PROC OLAP syntax, see Comparing PROC MDDB Code and PROC OLAP Code. “

(Thanks to Brian for forwarding this along.)