[ZODB-Dev] Blobstorage shrinks only after the second pack operation - bug or feature?

[Andreas Jung]

Jim Fulton wrote:
> On Sun, Dec 30, 2012 at 12:22 PM, Andreas Jung <lists at zopyx.com> wrote:
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>> Jim Fulton wrote:
>>> On Sun, Dec 30, 2012 at 3:50 AM, Andreas Jung <lists at zopyx.com>
>>> wrote:
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>>>> I noticed a strange behavior with packing a storage having lots of
>>>> data in a blob storage (Plone 4.2, Zope 2.13).
>>>>
>>>> I had a large Plone site (5 GB of data in blobstorage) in a
>>>> dedicated storage. I removed the Plone Site object and packed the
>>>> storage through the Zope 2 database management screen. The size of
>>>> the Data.fs went down however the blobstorage size remained the
>>>> same. Packing a second removed the obsolete data from the blob
>>>> storage.
>>>>
>>>> So why do I have to pack two times in order to get a minimized
>>>> blob storage?
>>> Without knowing more details, it's impossible to know.
>>>
>>> What did you have pack-keep-old set to?
>> I used the default of the Zope 2 UI which is 0 (days).
>
> You didn't answer my question.  I didn't ask how many days you packed to.
> I asked if you set pack-keep-old. I'm guessing from your response that you
> didn't.

There is no such value exposed exposed in the Zope 2 database management 
control panel. It only offers the same packed-to value as it did ten years
ago. 

Andreas
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