Relational Database Management System (RDBMS) have been around for quiet sometime. They came evolved the need to segregate flat file data into logical groups. Thus providing efficient storage and better search and query capabilities.
With the recent improvements in search tools and cloud based storage. Document Database management systems are gaining ground. All you have to do is create a logical document, ie. data populated in a group of fields. With the advances in search tools/ algorithms. You need not maintain referential integrity. Just save the document and run free text search tools to fetch necessary data.
With cloud technology gathering, large document databases can be maintained on several large clusters.
Its a way this is funny. First we had large mainframes where everythig was maintained in a flat file. Then we had relational databases where we split everything into denormalized tables. With documents DB we are going back to flat file storage.
This is very similar to the lotus notes technology being developed by IBM. RDBMS will continue for the simple reason that these can be quickly installed and maintained on standalone machines. We need to wait and watch how soon enterprises adopt this technology.
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