摘要：今天闲来学习了一下SQL性能优化方面的知识，有以下学习收获，欢迎大家指点。测试环境：90W，单条记录约3KB，数据库：MSSQL2005测试前清除缓存DBCC FREEPROCCACHEDBCC DROPCLEANBUFFERS一、翻页性能测试1、Topselect top 10 * from message where id not in (select top 20 id frommessage where classid=77 order by id desc ) and classid=77 order by id desc2、Max/Topselect top 10 * from m 阅读全文