ORACLE commit

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无论之前是上百万条数据，还是一条数据的DML处理，使用commit提交时间相同。
原因是：
ORACLE 在执行DML操作时，同时会对数据文件和重做日志（redo log）进行操作，
是同步进行的，当到全部执行完成后，使用commit时所作的只是收尾工作。
所以时间相同。
异步commit：
查看：show parameter commit_write;
设置：
是否批量提交：immediate / batch
是否提交后马上LGWR ：wait / no wait
具体设置：immediate,no wait(默认) / bach, wait
批量提交问题：无法保证事务一致性

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