SQL Server系列之 删除大量数据
一、写在前面 - 想说爱你不容易 为了升级数据库至SQL Server 2008 R2,拿了一台现有的PC做测试,数据库从正式库Restore(3个数据库大小夸张地达到100G+),而机器内存只有可怜的4G,不仅要承担DB Server角色,同时也要作为Web Server,可想而知这台机器的命运
一、写在前面 - 想说爱你不容易
为了升级数据库至SQL Server 2008 R2,拿了一台现有的PC做测试,数据库从正式库Restore(3个数据库大小夸张地达到100G+),而机器内存只有可怜的4G,不仅要承担DB Server角色,同时也要作为Web Server,可想而知这台机器的命运是及其惨烈的,只要MS SQL Server一启动,内存使用率立马飙升至99%。没办法,只能升内存,两根8G共16G的内存换上,结果还是一样,内存瞬间被秒杀(CPU利用率在0%徘徊)。由于是PC机,内存插槽共俩,网站空间,目前市面上最大的单根内存为16G(价格1K+),就算买回来估计内存还是不够(卧槽,PC机伤不起啊),看样子别无它法 -- 删数据!!!
删除数据 - 说的容易, 不就是DELETE吗?靠,如果真这么干,我XXX估计能“知道上海凌晨4点的样子”(KB,香港服务器,Sorry,谁让我是XXX的Programmer,哥在这方面绝对比你牛X),而且估计会暴库(磁盘空间不足,产生的日志文件太大了)。
二、沙场点兵 - 众里寻他千百度
为了更好地阐述我所遇到的困难和问题,有必要做一些必要的测试和说明,同时这也是对如何解决问题的一种探究。因为毕竟这个问题的根本是如何来更好更快的操作数据,说到底就是DELETE、UPDATE、INSERT、TRUNCATE、DROP等的优化操作组合,服务器空间,我们的目的就是找出最优最快最好的方法。为了便于测试,准备了一张测试表Employee
. ( , (50) NULL, (50) NULL, );

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