Re: RE: RE: Online vs offline backups

hi, Mercadante, Thomas F£¬ÄúºÃ£¡

    But according to Oracle Document(which i believe), oracle backup and recovery guide (version 8.1.6)page 4-4: it said:

   Use operating system commands or a backup utility to make backups of all datafiles and all control files specified by the CONTROL_FILES parameter of the initialization parameter file. Also back up the initialization parameter file and other Oracle product initialization files. To find them, do a search for *.ora starting in your Oracle home directory and recursively search all of its subdirectories.

	You can see, oracle mentions everything it need, but it does not mention the online redo log.
	And:
	Is the online redo log useful in recovery since you do a full  clean cold backup? Just do a clear logfile group 1,2,3 and you cleanly opened your database when you Just restore the datafile,controlfiles.If you want to make full recovery, the online redo log is also totally USELESS. And if you carelessly overlay the old online redo log, the CURRENT ACTIVE ONLINE REDO LOG WILL BE DESTROYED! so , you cannot do complete recovery.
	This is my opinions.Though i also do not do coldbackup.

Good luck!

            chaos
            chaospku_at_163.net

zhu chao
DBA of Eachnet.com
86-021-32174588-667

ÔÚ 2002-06-19 06:43:00 You wrote:
>chal_ping
>
>What? Makes no sense. Why NOT backup everything if you are taking a Cold
>Backup. Why make yourself perform an open reset logs upon a recovery?
>
>This is bad advice.
>
>Personally, I use Rman performing hot backups all the time. My database is
>*always* open to the world.
>
>Tom Mercadante
>Oracle Certified Professional
>
>
>-----Original Message-----
>Sent: Wednesday, June 19, 2002 8:38 AM
>To: Multiple recipients of list ORACLE-L
>
>
>Ferenc Mantfeld£¬
>
>>The same person that advocated a cold backup
>>did not back up the online redo logs, so what use was it anyway, since the
>>only way they would force open their DB is with a resetlogs option anyway.
> For cold backup, oracle does not recommend backup the online redo
>log. And if you restore the whole cold backup, why need the online redo log?
>I am sure people doing cold backup will do shutdown normal/immediate, not
>shutdown abort.So there is no need to backup the online redo log at all!
>Backup the online redo log also take the risk of damage the current online
>redo log when you want to do full recovery.
> So, never backup the online redo log when doing cold backup.
>
> ÖÂ
>Àñ£¡
>
> chal_ping
> chaospku_at_163.net
>
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Author: chaos
  INET: chaospku_at_163.net

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