[ZODB-Dev] Upgraded from ZODB 3.8 to 3.10, do I need to upgrade my Data.fs?

[Hanno Schlichting]

Paul Warner <paul.warner <at> gmail.com> writes: 
> We have been running an in house application on ZODB 3.8.2 and
> recently upgraded to 3.10.5.  We run a ZEO server with FileStorage.
> It seems like everything works great, no actions on our part, but I
> wondered if it is suggested to some how migrate the on disk
> FileStorage to take advantage of new features or optimizations in
> 3.10?

The format and data in the file storage has stayed exactly the same for quite
some time, so no migration is necessary. For 3.10 the index file format
(data.fs.index) has changed, but this has happened transparently.

ZODB 3.8 introduced experimental support for blobs (binary large objects), which
have gotten stable and production ready with 3.9. There's no good documentation
for them, but z3c.blobfile might serve as an example
(http://svn.zope.org/z3c.blobfile/trunk/src/z3c/blobfile/). If you have any data
that's bytes of 1mb or more each, you should investigate blobs. Not having to
load all that data into the ZODB caches alone is really helpful, not to mention
the various nice effects of having a smaller main file storage or the various
supported backends for blobs.

Apart from those, there's been a multitude of new config options listed in the
changelogs (http://pypi.python.org/pypi/ZODB3/3.9.7#id14 and
http://pypi.python.org/pypi/ZODB3/3.10.5#id10). It's hard to tell, if any of
those would be helpful in your particular case.

Hanno