Read-only transactions see only those changes that were
committed at the time the transaction began and do not allow
INSERT, UPDATE, and DELETE statements.
Oracle隔离级别 : 只读模式
只读事务只能看到事务执行前就已经提交的数据，且事务中不能执行DML语句
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/10599713/viewspace-988997/ ，如需转载，请注明出处，否则将追究法律责任。
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