I think this all gets back to eager anticipation of TSM v6 features being expressed about a year ago, when excitement about a DB2 database was countered by experienced cautions to "beware what you wish for". The "classic" ADSM/TSM database was tailored to the product, and contained efficiencies. DB2 is a general database, where you can expect more space utilization in its overall processing.
See http://publib.boulder.ibm.com/infocenter/tsminfo/v6/index.jsp?topic=/com.ibm.itsm.srv.doc/c_archive_log_space.html for some basic information, and IBM document numbers 7015353 and 7015525 for webcast PDF material on the new database. Richard Sims
