I am going to buy one hosting plan, but i am not sure that i shall go for heap size of 32 MB or more, is there any way out to figure out that current heap size is doing good for my wensite or not?? how to know that when my site needs dedicated server ??
also shared jvm hosting would be ok for me since i am just launching my website ?traffic will slowly increase
That depends on what those users are doing, and what they cause the code/server to be doing. It's certainly a size where you may have to consider a dedicated machine (or at least where you may want to consider one).