On Jun 12, 2009, at 10:19 AM, Chris Withers wrote:

> Jim Fulton wrote:
>> As threatened, I've created a multi-database garbage collector:
>>   http://pypi.python.org/pypi/zc.zodbdgc
>> Bonus: I've also included a multi-database verification script.
> This looks great :-)
> A couple of questions:
> - How do I know if my databases use 64-bit object ids?

You have to ask the storage author.  All of the databases included  
with ZODB do.

For better or worse, lots of ZODB infrastructure assumes 64-bit oids.

> - Which databases support efficient iteration
>  from transactions near the end of the databases?
>  I assume a normal Filestorage would?

Yes.  This is the only database included with ZODB for which this is  
an issue.

Of course, for ZEO, this depends on the storage being served.


Jim Fulton
Zope Corporation

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