论文部分内容阅读
世界数据库发展趋势(1)向产业化商品化方向发展。一些发达国家积极按照实物商品的生产、销售、流通和批发模式进行数据库的生产与销售。实行数据有偿服务,规模和年产值皆较为可观,如美国的数据库生产商有1000多家,年产数据库4000多个,占世界数据库总量的80%;有著名的大型国际联机检索系统13个,年产值40多亿美元。欧共体有1000多个商业化数据库,联机系统50多个,其中英国有300多个数据库,较大的联机系统4个,法国500多个数据库,联机系统42个,德国300多个数据库,8个联机检索系统。欧洲的年产值也达20
World Database Trends (1) to the industrialization of the commercial development. Some developed countries actively carry out database production and sales according to the production, sales, circulation and wholesale patterns of physical goods. Implementation of the data paid services, the scale and the annual output value are more substantial, such as the United States more than 1,000 database producers, with an annual output of more than 4,000 databases, accounting for 80% of the world database; the famous large-scale international online search system 13 , The annual output value of more than 4 billion US dollars. The EC has more than 1,000 commercial databases and more than 50 online systems, including over 300 databases in the United Kingdom, 4 large online systems, over 500 French databases, 42 online systems, more than 300 German databases, 8 online search system. Europe also has an annual output of 20