[20151221]sql语句优化.txt --自从发现开发乱用distinct以后，链接http://blog.itpub.net/267265/viewspace-1871989/ --我看sql语句特别注意连接多个表,但是显示仅仅一个表的情况,上个星期五，发现一条： sql_id=dpdk3xfd6cvky SELECT EMR_DJMX.ZSFL FR...

文章 2015-12-09 来自：开发者社区

[20151209]一条sql语句的优化(续).txt

[20151209]一条sql语句的优化(续).txt http://blog.itpub.net/267265/viewspace-1852195/ --上次提到其中1条sql语句： 1.环境： SYSTEM@192.168.99.105:1521/dbcn> @ver1 PORT_STRING ...

文章 2015-12-03 来自：开发者社区

[20151203]一条sql语句的优化.txt

[20151203]一条sql语句的优化.txt --很久没有看生产系统的awr报表，昨天下午看了一下，我非常讨厌看生产系统的awr报表，看着开发写的sql语句有时候心情会非常不好。 --实际上拿生产系统的sql语句写blog非常困难，别人没有你的环境(即使表述出来，也要浪费很长的篇幅)，写出来的东西大部分仅仅自 --己读得懂。 1.环境： SYSTEM@192.168.99.10...

文章 2015-07-15 来自：开发者社区

[20150715]一条sql语句的优化.txt

[20150715]一条sql语句的优化.txt --生产系统发现一条语句。 update presc_check t set t.diagnosis=replace(t.diagnosis,',慢性病drugs','') --第1眼看到的感觉真的很想骂人，什么能没有where条件呢？ --我把这个表拷贝过来。这个表占用1G多1点，在测试环境执行看看： -- copy from s...

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