[OSM-dev] OSM and CouchDB/GeoCouch

[Lars Francke]

> It looks like our schemas are mostly identical, but in my experience,
> MongoDB used more and more time importing the index as the import continued.
> An import of the dataset for TX took several hours, but import speeds
> dropped off markably as the import continued and, presumably, as the
> geoindex grew.

This is just a hunch so I might be wrong. Worth checking out though:

Normally you shouldn't use indexes when doing a large import. Just
create them after the import has finished. This is due to the constant
need to rebalance the Tree (which I presume they use for the index).

But as I said: I have never used MongoDB so far and this is just a
general observication.