[ZODB-Dev] Re: roll back filestorage zodb to a certain date?

[Tres Seaver]

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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.

Tres.
- --
===================================================================
Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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