93
P.A. Bernstein, S. Melnik: Meta Data Management,
ICDE'04 Boston
Some Lessons
lA common
encoding of models is hard and involves compromises
ØDifferent styles
of reifying relationships
ØCRM stores
transitive relationships
lMatch needs to
invent generalizations
ØIn FMA, arterial supply, venous drainage,
nerve supply,
lymphatic drainage
ØIn CRM, these
all map to isServedBy
lOn big models,
Match is expensive
ØSome steps
required days to execute
ØCross-product
filled 80 GB (< 1GB input).