%0 Journal Article
%T Application Analysis of Cost Estimation for Operation of Data Connection in Histogram<br>直方图下数据连接操作代价估计应用分析
%A FENG Kai-Ping
%A CHEN Heng
%A FENG Chao-Ying
%A <br>冯凯平
%A 陈衡
%A 冯超颖
%J 计算机系统应用
%D 2012
%I 
%X Histogram is a kind of important tool in data query. Cost estimation needed in query operation of database varies in methods, in which histogram is that is most convenient for use and maintenance. Histogram categorizes and sets barrels to all tuples in the relations, calculates the size respectively for each barrel, and then summarizes, thus making the price statistics closer to the real value. In application of the actual program, this research works out methods that convert the connection of the relations to a variety of histograms and ways to estimate the operation cost by using histograms.
%K histogram
%K cost estimation
%K tuple
%K equal width
%K data connection
%K query<br>直方图
%K 代价估计
%K 元组
%K 等宽
%K 数据连接
%K 查询
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=D4F6864C950C88FFCE5B6C948A639E39&aid=2F008F04A30914BA845AADA6DD2B929A&yid=99E9153A83D4CB11&vid=659D3B06EBF534A7&iid=F3090AE9B60B7ED1&sid=5D9D6A8FC2C66FD8&eid=2BA123C6EB9D54C2&journal_id=1003-3254&journal_name=计算机系统应用&referenced_num=0&reference_num=10