[ZODB-Dev] https://github.com/zopefoundation/zc.beforestorage

[Jim Fulton]

On Fri, Sep 27, 2013 at 12:35 PM, Christian Tismer <tismer at stackless.com> wrote:
> Hi,
>
> I saw me subscribed to zc.beforestorage , today.

Congratulations! ;)

> If I'm not mislead, versions are no longer supported in 4.0, or
> is this still a supported approach?

"versions" were removed in 3.9.

> I think history should not depend on having pack()'ed or not,
> but an explicit snapshot feature that puts a set of objects
> into some history object.

<shrug>  That would be a new feature.  One I've even contemplated,
sort of, in a notional FileStorage2 design that stores data in a
sequence of files, which would allow point-in-time snapshots.

> Has that been discussed, and can someone please point me at it?

Undoubtably, but I can't think of an instance in particular.

beforestorage takes advantage of the fact that most ZODB storage
implementations keep a limited sequence of transactions to provide
a limited form of time travel and, most importantly, to provide a temporary
snapshot of a database that's being written, mainly for use with
DemoStorage.

Jim

-- 
Jim Fulton
http://www.linkedin.com/in/jimfulton