Look at this : 
http://blog.notdot.net/2010/03/Announcing-a-robust-datastore-bulk-update-utility-for-App-Engine

On 25 mai, 19:53, App Engine N00B <vivek.securitywiz...@gmail.com>
wrote:
> Hi,
>
> Google is proposing changing one entry at a time to the default
> values ....
>
> http://code.google.com/appengine/articles/update_schema.html
>
> I have a model with a million rows and doing this with a web browser
> will take me ages. Another option is to run this using task queues but
> this will cost me a lot of cpu time
>
> any easy way to do this?

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