Google - where we can store the data of html like sql,my sql,oracle..?

If you want to store HTML, I'd recommend using a text or memo field as opposed to a varchar with a specific length. In SQL Server, each record only allows you to store about 8,000 characters within the record itself. For longer fields, they are recorded as a pointer to another location and can thus contain much more than 8000 characters. As HTML is often more than 8k, I'd do it this way. If you want to index these fields (by default text fields aren't indexed), you'll need to turn on Full Text Indexing.