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NoSQL [not only SQL] is a movement towards document stores that do not make use of the relational model. The fundamental paradigm shift is in the way they store data. For example, when you'd need to store data about an invoice, in RDBMS you'd need to distill this information into tables and then use a server-side language to transform this data back into real life objects. On the other hand, in NoSQL, you just store the invoice. NoSQL is schema free, which means you don't need to design your tables and structure up front - you can simply start storing new values.

Continuing the invoice example, some invoices may include a VAT number, some may not. In a RDBMS, you'd need to tell your table to first accept a VAT number and then that it could possibly be null. In NoSQL, however, you can just store invoices with or without a VAT number - there is no schema. Keep in mind that NoSQL is not a silver bullet. If your data is truly relational, sticking with your RDBMS would be the right choice.



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