In the past, we've been able to reclaim instances that were not
reachable from the root or in an indexed object. However, with the
new schema model, all persistent objects are reachable implicitly by
being in the store's oid->class table (i.e. a get-instances-by-class
now works for any persistent class). Thus to reclaim storage you have
to explicitly drop an instance.
Is this good or bad? It's nice to always be able to reach instances
of a class, but for reclamation we could have a class option which is
something like :weak-class-index t. That is instances may be
reachable by get-instances-by-class but it's not guaranteed after a gc
or migration.
Anyone have thoughts on this? How should we define reachability in
this new model?
Thanks,
Ian
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