> I'm wondering, is the ZODB easily 'fragmented' or .. un-optimized ?
> If so, are there any tools/functions that will 'unfragment' / optimize
> it?

This really depends on the undelying storage used.  

> Does the 'pack database' in the Administration menu do this? 

Packing does two things:

  - It removed records for objects that are no longer referenced
    (as of the pack time), or, IOW, it doesm garbage collection.

  - For storages that support undo (and time travel), it also
    removes records that were not current as of the pack time.

Both of these, especially the latter are a little bit similar to 
defragmentation or optimization. In addition, the particular storage
implementation may have other issues/tools. For example, if the
Oracle storage is used, them whatever fragmentation or optimization
issues or adminstration tools provided by Oracle apply.

> If so,
> it could be a Good Thing (tm) to have separate optimize and packing
> (history deletion etc.) functions (buttons).

This doesn't really apply. 
> Is there any way to make an object not keep history on itself or on
> contained objects ?

Currently, the only way to do this is with a non-versioning storage, 
such as the Berkely DB storage.


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