hi,

Can anyone recommend a hassle free tool that takes Java Entity objects code and generates an ERD? 

thanks,

Zvika

One more .Net driver  for connecting to MongoDB - NoRM - open-source library managed on GitHub.

Speciality of this project in linkage of .Net types and document model of MongoDB.

With NoRM very easy to manipulate with .Net type without necessity to copy them to/from documents for saving/resolving in/from DB like  MongoDB-CSharp Driver.

NoRM Home http://wiki.github.com/atheken/NoRM/

Sample

    var coll = (new Mongo(connString)).GetCollection<Product>();

    //create a new object to be added to the collection
    var obj = new Product();
    obj._id = ObjectId.NewObjectID();
    obj.Title = "Shoes";

    //save the object
    coll.Insert(obj);

    //find the object
    var obj2 = coll.FindOne(new { _id = obj._id}).First();

Large scale analysis solution must be able to provide very fast response time (<1sec) to some complex queries which are typically structured from a large fact table which is joined to many dimension tables and grouped-by them.

Using standard SQL databases such as MySQL InnoDB (as well as leading commercial vendors) will result in poor performance even when correct indexes are set up since in many case the database will be forced to perform unnecessary full table scans which will kill the performance if dimension tables are large.

Modern projects need to manipulate with huge data amount, as result the necessity of high scalability and  high performance is very actual and always grows.

RDBMS databases cannot supply ultimate solution and alternative concepts like in NoSQL systems look very interesting.

The first interesting option is key-value stores like Google Big Table or Cassandra that provide fast and extremely large-scale solution but you can forget the comfort work with SQL queries like in RDBMS databases.  

Another option that tries to combine between advantages of RDBMS databases and key-values stores  is document-oriented databases like MonogDB.

MongoDB is development by commercial company as open-source project written in C++.

There are a lot of documentation, tutorials and samples on project site.