NerdBorns wrote:I'm working on a project.. In which i have to build a server. So, firstly.. several things are in my mind..
(Still I'm not owning a Pi.. Planning to buy a
Raspberry Pi 2 model B..

)
1. Can i use any
RED HAT OS for Pi 2?
I'm not sure if there is one available now. Originally the main OS was going to be a RH one, but plans had to be changed and Debian was initially chosen, then it switched to Raspbian which is a version of Debian built specifically for the Pi.
2. If not, suggest me a flavor. (Consider the OS for web server and should be able to install database packages)
Raspbian. It is the only officially supported OS. You will find much more support for the Raspbian OS than any other on the Pi. It works exactly the same way as Debian.
3. Web server should be able to handle minor/tiny amount of data transactions. ( Just few values from Oracle database to php pages.)
Which database? If there is support in the standard Debian build for the DB you need to access, then it will be in Raspbian as well. (Make sure anything you try to install says that it runs on Raspbian on the Pi, otherwise you may end up trying to install Linux PC code which won't work).
Both the Apache and NginX webservers will run on the PI.
4. Desired size of MicroSD card for OS+Storage.
8GB minimum. Better to start with 16GB. Speed isn't critical, but the decent branded faster ones can be better. Don't buy one that seems very cheap as there are a lot of fakes out there that report a larger capacity than they have.