Oracle中的truncate语句
最近在项目中碰到个问题，更新过期数据时事务没有回滚。前前后后仔细检查了一遍事务配置，始终没有找出问题所在。最后经过单步调
最近在项目中碰到个问题，更新过期数据时事务没有回滚。前前后后仔细检查了一遍事务配置，始终没有找出问题所在。最后经过单步调试，总算找到了问题根源：使用truncate删除数据，，导致事务被提交。
1、在Oracle中删除数据后还能回滚是因为数据被放在了undo表空间。
2、DML = Data Manipulation Language，数据操纵语言，使用undo表空间；
DDL = Data Definition Language，数据定义语言，不使用undo表空间。
delete是DML语句，truncate是DDL语句，DDL语句隐式提交，即使当前事务出错，也无法回滚。
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