How much work in the Dispose method?

Question

How much work should be done in a Dispose method? In constructors I've always taken the stance that you should only do what is absolutely necessary to instantiate the object. This being the case I've also always taken the approach that you should ONLY be cleaning up open resources when disposing. Closing files, freeing memory, disposing of child disposable object, etc. You shouldn't be doing lengthy processes like touching files, accessing databases and such in the Dispose method.

Am I wrong? Are those action's OK as long as you are handling any possible exceptions so they don't bubble out of the method? I just don't think doing a lot in Dispose is a good idea. I would like to know what the community thinks.