关于 oracle doc中用户管理的备份 一段的不解

wuxiaobo_2009

http://docs.oracle.com/cd/E11882 ... backup.htm#BRADV199
chapter 28.
为什么每次最后 oracle 都要加这句话：

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3. Take the tablespace offline using normal priority if possible, because it guarantees that you can subsequently bring the tablespace online without having to recover it. For example:
   
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5. SQL> ALTER TABLESPACE users OFFLINE NORMAL;
   
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7. Back up the offline data files. For example:
   
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9. % cp /oracle/oradata/trgt/users01.dbf /d2/users01_'date "+%m_%d_%y"'.dbf
   
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11. Bring the tablespace online. For example:
    
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13. ALTER TABLESPACE users ONLINE;
    
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15. Note:
    
16. If you took the tablespace offline using temporary or immediate priority, then you cannot bring the tablespace online unless you perform tablespace recovery.
    
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18. Archive the unarchived redo logs so that the redo required to recover the tablespace backup is archived. For example, enter:
    
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20. ALTER SYSTEM ARCHIVE LOG CURRENT;
    

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ALTER SYSTEM ARCHIVE LOG CURRENT;   why 进行这个操作呢？

jackson198574

原文看不到呢，不过从链接上看楼主应该是有备份的问题。这个语句是归档重做文件，写在备份里目的是保证最新的操作已经刷到了归档里，保持备份尽可能是最新的状态。10以后好像会在备份发起的时候自动归档重做日志。

dingning239

将当前操作归档到归档日志中