What NoSQL database use to store complex objects?

I don't know much about NoSQL database, but with some research, I think it can improve and solve the problems I'm having.

I have a principal complex object in my program called Page. It has various TextBlock that has various Token.

I don't need individual operations on these objects, but I need the entire object, the Page.

I need to process all objects stored in database and there is a lot of then (to millions). Retrieving the o开发者_如何学Cbjects in a RMDB is very slow, I think that a NoSQL database will solve my necessity, but I don't know what to use.

At the moment, I'm using PostgreSQL.

What NoSQL database can I use to store complex objects and can be used with Java?

Any NoSQL database can store your object by using a serializing method. Normally NoSQL database work handy when you know which object you have to retrieve from the database, If you need to have some query on your data think about CouchDB (or Couchbase) or MongoDB which use json like document to save data and gives you querying ability with different pros and cons. Select the one you according to your requirement.