Using existing model to train again

[Kasi Subrahmanyam]

Hi team,
I have trained a model in naive Bayes using training data of 1 million
records. Now I have another 1 million records . Can I add this new training
data to the existing model and train it again to get a new model instead of
passing all the 2 million records at once to get a model.

Thanks,
Subbu