In a distributed database system, a program often referred to as the database's back end runs constantly on a server, interpreting data files on the server as a standard relational database. Programs on client computers allow users to manipulate that data, using tables, columns, rows, and fields.
A solar energy system big enough to power a computer and a few other small items might cost you about $700 to $1000. These are also well suited for RVs, boats and camping. Learn more about portable solar energy units.
Wind power, for example, costs about $80 per megawatt-hour of electricity when the lifetime costs of building a new project are factored in, according to the Energy Information Administration. Solar is closer to $130 per megawatt-hour.