My understanding is UNINDEXED properties add no write cost at all. See 
https://developers.google.com/appengine/docs/python/datastore/entities#Understanding_Write_Costs


On Friday, December 21, 2012 1:29:26 PM UTC-8, Ryan Chazen wrote:
>
> Hi - I find the following a bit confusing - is it correct?
>
> Using unindexed properties only:
>
> If I write 10 numbers in a list to the datastore, _ah/admin on the local 
> dev server shows 10 write operations.
> If I write 10 numbers inside an embedded entity (or comma delimited), the 
> local dev server shows 1 write operation.
>
> Since billing is by write operations, is using the list 10x more expensive 
> in reality? If so, I need to make sure all of my unindexed properties get 
> put into an embedded entity first before writing as it will mean I only use 
> 1 write op for all unindexed properties...

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