[elephant-devel] garbage collection

[Dmitri V. Gorbatovsky]

Thanks a lot, Ian.
Finally I get it right.
I makes a few wrong assumptions about
robustness and simplicity of general migrate procedure ,
consider btrees and objects references.

Thanks again, Dmitri

On Wednesday 11 July 2007 22:18, Ian Eslick wrote:
> Some documentation:
>
> http://common-lisp.net/project/elephant/doc/Repository-Migration-and-
> Upgrade.html#Repository-Migration-and-Upgrade
>
> http://common-lisp.net/project/elephant/doc/Migration-and-Upgrading-
> API.html#Migration-and-Upgrading-API
>
>
> This is the safest route:
>
> Start lisp & load elephant:
>
> => (setf source-store (open-store '(:BDB "~/bdb/db-source")))
> => (setf target-store (open-store '(:BDB "~/bdb/db-result")))
>
> => (migrate target-store source-store)
>
> Exit and restart lisp:
>
> => (open-store '(:BDB "~/bdb/db-result"))
>
> That's it!
>
> I recommend that you run a simple validation test:
> - create a simple database
> - populating it with a bunch of data, record the size
> - delete 1/2 of the data randomly (or every other object)
> - call (optimize-layout *store-controller*), record the compacted size
> - do the migration as described above, record the resulting size
>
> I'm sure we'd love to see the three different sizes that result from
> this simple test and I'm sure you'd feel better knowing that it works!
>
> Regards,
> Ian
>
> On Jul 11, 2007, at 2:21 PM, Dmitri V. Gorbatovsky wrote:
> > On Wednesday 11 July 2007 04:32, Ian Eslick wrote:
> >> However, the best way to reclaim disk space today is to migrate from
> >> your current BDB store to a new one.  This will copy over only those
> >> objects that are globally reachable; namely anything reachable from
> >> the controller-root and all indexed instances.
> >
> > ...
> >
> >> If the documentation doesn't make this process clear, please write
> >> back to us.
> >>
> >> Good luck,
> >> Ian
> >
> > Thank you, Ian.
> > Yes, I am afraid, I can't get it from the documentation.
> > If it possible, could you please provide me with
> > simple example of whole database migration from one directory
> > ~/bdb/db-source  to another ~/bdb/db-result.
> >
> > Thanks, Dmitri
> > _______________________________________________
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> > elephant-devel at common-lisp.net
> > http://common-lisp.net/mailman/listinfo/elephant-devel
>
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