André van Toly wrote:
Op 12-mei-2006, om 11:35 heeft Nico Klasens het volgende geschreven:
This is exactly the point in which MMbase and Hibernate made
different design choices. The hibernate guys will tell you never to
use many-to-many relations anywhere. There is always a better
alternative. MMbase uses many-to-many relations everywhere. But they
both solve the persisitency problem
Is it not true that it is your own choice to use many-to-many relations
while building MMBase applications? You can avoid them and (maybe, we
don't know because there are no tools to measure) build a fast
performing application.
I think the point is that mmbase is allways using a join table (ei the
relation) to join twoo nodes. That is not good for performance. Wat is
really bad is if the same join table is used to join say 5 or 6 steps in
one query. mmbase knows no other way. Specially when you combine this
with crappy database inheritance, the insrel table becomes a problem..
Ernst
---André
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