The Customer Total of Erupting:An Important Parameter of Evaluating and Using Database——And summarizing the researches about the evaluation of the present databases

The author puts forward that the customer total of erupting is an important parameter of evaluating and using database.And the thesis induces and analyses the researches about the evaluation of the present several kinds of database,pointing out that database evaluation system tacks the index,that is the customer total of erupting,customer inaction deadline,it will lose sound and authoritative.It establishes a database evaluation system which is more complete and maneuverable.