Combine the advanced concepts of SpringBoot with the simplicity and elegance of C#, declarative programming, focus on"what to do"rather than"how to do it", and write code at a higher level.SummerBoot ...

大家都知道mysql的默认数据库隔离级别嘛？ 是的，就是RR，但是呢，为什么阿里这些互联网大厂，把mysql的数据隔离级别设置为RC呢？ 大家应该都记得mysql数据库的四种隔离级别吧。 RC，也就是读已提交，当前事务只能读取到其他事务提交的数据，所以这种事务的 ...

2017-10-11 16:23:55.178 CST,"pgxz","postgres",11499,"127.0.0.1:2329",59ddd50c.2ceb,1,"idle",2017-10-11 16:23:40 CST,3/26053,0,LOG,00000,"statement: select * from pg ...

additional hard parses which were consuming significant database time. 我的理解，优化器在解析SQL语句时，会把文本变量值，改成绑定变量值，然后计算出此语句的哈希值，当发现此哈希值，与我上面创建SQL PROFILE里的 v_sqltext 值一致时，则使用上面固定的执行计划，不再硬解析。

LIKP INNER JOIN LIPS ON LIKP~MANDT = LIPS~MANDT AND LIKP~VBELN = LIPS~VBELN LEFT OUTER JOIN ZTPRINT ON LIKP~MANDT = ZTPRINT~MANDT AND ZTPRINT~ZTCODE = 'ZMM_S0005_1' AND ZTPRINT~ZKEY = LIKP~VBELN WHERE ...