Maybe you need to re-think your database models. This message may
help: 
http://groups.google.com/group/google-appengine/browse_thread/thread/52d44bde94f2e8b8?pli=1

On 9 ene, 17:57, nischalshetty <nischalshett...@gmail.com> wrote:
> Say a user selects 5000 unread messages (each message is an entity)
> and wants to mark all of them as read. It would be a massive update.
> Can anyone help me on what the best way to do such a large update is?
>
> Is there a different way to do this apart from updating each of the
> 5000 entities by marking their status as read? Even if there is no
> escaping the large update, how do you update so many entities on
> appengine?

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