There IS a doc written by Andy Raibeck called 'Using the ADSM SQL Interface'
which hass quite a comprehensive overview of the TSM DB. I found it by
typing the name in, in quotes, in google.
Infact, here's the link
ftp://borg.isc.ucsb.edu/pub/adsm/docs/!updates/raibeck.pdf
hope it helps.