I assume that SQL databases ( Banks? Telecom?) can handle an used car shop. No need for an unstructured data tool.
> +1, sql databases has limited number of inserts/updates per second. Even > with highend hardware you won't have more than XXX operations per > second. As Thomas said, you should feed something like nosql database > from www server and use other tool to do aggregation and batch inserts > to postgresql. It will scale much better. > > Marcin