Use Postgresql 9.2 now it's have HSTOR a key/value json support, can scale 
linearly to 64 cores, read queries can be up by 4x faster

See more: 
https://postgres.heroku.com/blog/past/2012/3/14/introducing_keyvalue_data_storage_in_heroku_postgres/

Other option is use NEO4J it's ACID.

regards
Joao Martins


Em quinta-feira, 25 de outubro de 2012 15h23min44s UTC-2, Dan Milon 
escreveu:
>
> Still, postgres foreign tables do not support SQL transactions, which 
> you'd need for an e-commerce product. 
>
> But its definitely interesting. 
>
> On 10/25/2012 06:58 PM, Stephen Handley wrote: 
> > re: the idea of using sql for some transactions and mongo for an object 
> > store 
> > 
> > http://www.citusdata.com/blog/51-run-sql-on-mongodb 
> > 
> http://www.craigkerstiens.com/2012/10/18/connecting_to_redis_from_postgres/ 
> > http://wiki.postgresql.org/wiki/Foreign_data_wrappers 
> > 
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