--为何构造cr块
http://www.itpub.net/forum.php?mod=viewthread&tid=1909066
--百度百科-CR
https://mbd.baidu.com/ug_share/mbox/4a83aa9e65/share?product=smartapp&tk=4a6d9aff9c2431f196b248a82e311ef5&share_url=https%3A%2F%2Fvhsagj.smartapps.baidu.com%2Fpages%2Flemma%2Flemma%3F_swebfr%3D1%26lemmaTitle%3DCR%26lemmaId%3D2188265%26from%3DbottomBarShare%26_swebFromHost%3Dbaiduboxapp&domain=mbd.baidu.com
--Oracle block cleanout 说明
https://mbd.baidu.com/ug_share/mbox/4a83aa9e65/share?product=smartapp&tk=abd4db7bd2ac449be195b00221f862ac&share_url=https%3A%2F%2Fkfs479.smartapps.cn%2Fpages%2Fblogdetail%2Fblogdetail%3F_swebfr%3D1%26id%3D5776787%26_swebFromHost%3Dbaiduboxapp&domain=mbd.baidu.com
--Oracle数据库中块清除（block clean out）算法介绍
https://mbd.baidu.com/ug_share/mbox/4a83aa9e65/share?product=search&tk=59db38164ce8708e3703233ea261ddec&share_url=https%3A%2F%2Fm.baidu.com%2Fsf%3Fpd%3Dtopone_trustpaper%26resource_id%3D55858%26word%3DOracle%25E6%2595%25B0%25E6%258D%25AE%25E5%25BA%2593%25E4%25B8%25AD%25E5%259D%2597%25E6%25B8%2585%25E9%2599%25A4%26ext%3D%257B%2522url%2522%253A%2522https%253A%255C%252F%255C%252Fcloud.tencent.com%255C%252Fdeveloper%255C%252Farticle%255C%252F2078978%2522%252C%2522srcid%2522%253A%252228420%2522%252C%2522jumptype%2522%253A%2522text%2522%252C%2522urlsign%2522%253A%25226647232955839457405%2522%252C%2522sitesign%2522%253A%25229687215639366812446%2522%252C%2522query%2522%253A%2522oracle%2Bcleanout%255Cu7684%255Cu6570%255Cu636e%255Cu5757%2522%252C%2522token%2522%253A%25222a4f4a%2522%257D%26top%3D%257B%2522sfhs%2522%253A1%257D%26atn%3Dindex%26lid%3D11704823018824757801&domain=mbd.baidu.com
