Can any one tell me how to connect azure ml studio with mongodb database
You need to use importdb. I stroingly recommend you read through the help in MS, all these topics are well explained. Specific instructions are here: https://msdn.microsoft.com/en-us/library/azure/mt772374.aspx
Also, have a look at this: https://msdn.microsoft.com/en-us/library/azure/dn905997.aspx?f=255&MSPPError=-2147217396
Please correct me, currently for creating web services for all models in r, i’m using PLUMBER package. This is right or not.
If you only want to create a compact and fast web service without having to build a layout etc, plumber library is indeed a good solution.
Also, you can use
R-Shiny to build an app which you can later deploy as a web service easily. Moreover, you can use html code inside shiny so you can customise your layout to your heart’s content. If you are using RStudio (which I definitely encourage if you don’t), you only need to select File > New File > Shiny Web App… Have a look at documentation and examples: R-Shiny
But this question is another completely different topic or am I missing something…?