Hi Chandan,
I did it a couple of years ago on my Model B (very first edition) and it worked fine.
I just remember that I had to install official Oracle JVM because with OpenJDK it didn't work at that time (but now it should actually)
For JDK install see
https://www.raspberrypi.org/blog/oracle ... pberry-pi/
For OrientDB install, just download the tar.gz file from here
http://orientdb.com/download/ then unzip and launch /bin/server.sh
See also this to install OrientDB as a system service
http://orientdb.com/docs/last/Unix-Service.html
To be honest it's been a while since the last time I tried it, if you have any problems please feel free to cross-post on OrientDB community group (
https://groups.google.com/forum/#!forum/orient-database), I'm sure someone has it running

(or I'll find some time to try it again on my RasPi

)
Cheers
Luigi