Hello Durga,
Converting mumps to other languages/database platforms is something that has been discussed a bit recently. If you are familiar with the hardhats group (google), you might have seen the post that started a lengthy discussion (http://tinyurl.com/c2tl65). This discussion started because of a company who purports to be able to convert VistA to java/rdbms. (http://www.mumps-migration.com/). My personal opinion on this is that such a large scale conversion is likely fraught with unintended, unmanageable side affects, but I wish them well all the same. Mentioned on this thread (I think) are some other tools that can expose mumps constructs relationally (PIP from GT.M and KB_SQL). PIP is free and open source while KB_SQL is a commercial offering.
My preference is to think of OpenVista as a datastore that already has some relational capabilities and find ways to make it more accessible to non-mumps realms. We have recently released a tool that we use in this manner. You can find more information about it at . If you prefer .net/C# you might peruse the Bridge component of as it might meet you needs.
As you probably already know, VistA contains a psuedo-relational data access layer, written in mumps, called FileMan whose arrangement and data structures are often quite similar to what you would find in a relational system. FileMan is the core for data access for VistA applications, so the more you can learn about FileMan, the better off you will be. You can find docs here. It is worth the investment of time to learn a bit about FileMan, IMO -- but you'll probably be able to determine in a short amount of time if FileMan internals are something that you are interested in.
Good luck,
Andy
