Which Database? Which Service?

摘要

Sometimes it feels like an embarrassment of riches. With the rapid growth of online information systems and the availability of databases on professional and general (sometimes known as consumer) online services—and on the Internet as well—how do you decide which online system you should choose as your primary or home system? The answer depends partly on each online service's characteristics: 1. Does it have the sources you are most likely to need? 2. Does the system and its search software make sense to you? 3. Can you understand, anticipate, and control the costs? 4.Can you get the training, support, and documentation you need to be a cost-effective searcher?