You will notice that BLC + MVC is not saving much additional diskspace compared to BLC.
But you should still do MVC because BLC data is uncompressed in spool and for backups whereas MVC keeps compressed in both cases.
I once did some comparison and these were the resulting sizes of one of the tables:
uncompressed: 100%
MVC: 63.8%
BLC: 31.0%
MVC + BLC: 28.4%
Other tables showed similar results.
You might ask Atana why they don't recommend it, i suppose it's because they can't predict the actual savings in their compression report anymore :-)
Dieter
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