Explain transactional annotation in brief?

Q1.If you hava 2 master server one in pune one and one in banglore. How do you replicate data. Q2.If user is added to the server pune. next request of user goes to banglore server how do you handle this. Q3.If application is deployed in pune but user in brazil facing latency upto 20 second how do you handle it Q4.Debugging of code snippet. Q5.If db table has 1 million records you want to add a new field how will approachi this

Talk about some of your recent projects