[ZODB-Dev] Re: roll back filestorage zodb to a certain date?
dieter at handshake.de
Wed Mar 21 15:26:28 EDT 2007
Jim Fulton wrote at 2007-3-21 10:06 -0400:
>On Mar 21, 2007, at 9:59 AM, Tres Seaver wrote:
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>> Jim Fulton wrote:
>>> On Mar 21, 2007, at 6:41 AM, Chris Withers wrote:
>>>> Hi All,
>>>> Is there any existing method or script for rolling back a ZODB
>>>> (filestorage-backed in this case,
>>> Back end to what?
>>>> if that makes it easier) to a certain point in time?
>>> Do you actually want to modify the file? Or do you simply want to
>>> access it as of a particular time.
>>> There is already a mechanism for opening a file storage as of a
>>> particular time.
>>>> eg: Make this Data.fs as it was at 9am this morning
>>>> If not, I'll be writing one, where should I add it to when I'm done?
>>> Before we talk about adding it anywhere, I'd like to see the
>>> semantics defined more clearly.
>> Chris could:
>> 1. Open the existing file in time-travel mode (readonly, so that it
>> loads no transactions later than the given point). The 'stop'
>> parameter to the FileStorage initializer is the one which
>> triggers time-travel.
>> 2. Open a new, writable filestorage.
>> 3. Run 'copyTransactionsFrom' on the new storage, passing the old,
>> and then close the storages.
>> 4. Restart his Zope with the new storage.
>I wasn't asking about implementation.
But, it is nice to know one (for the rare cases when one has to recover
from a catastrophic human error).
As such a functionality is only necessary in rare occasions,
I think, it need not be sophisticated.
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