Hadn't seen this thread which answers some of my questions

http://groups.google.com/group/google-appengine/msg/ad4d1d2a14361797

On Jan 3, 8:10 pm, jd <[email protected]> wrote:
> Hi,
>
> I am in the process of importing data into my application and notice
> about 10x clock time CPU usage - that is each 30 second task uses
> about 300 seconds of CPU quota.  I assume that this is mainly used
> indexing my entities - each has about 70 properties indexed (a
> geospatial "map block" index).
>
> Now I have modified my custom indexes and they are still building.
> But I don't see the CPU time accounted for anywhere.  Is this _free_
> CPU time?
>
> If so, is it cheaper to remove all indexes before importing data by
> setting properties as unindexed and removing custom indexes, import
> the data and then add the indexes again?
>
> If I modify an Entity to set a property from unindexed to indexed will
> a new "implicit index" be created?  Will I have to re-put the entities
> to include them in the index?
>
> Thanks,
>
> John

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