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Home -> Community -> Mailing Lists -> Oracle-L -> Re: hotbackup: cp clonefile versus alter database backup controlfile
> I have used "diff" on unix to compare the control files from "cp" method
and
> "ALTER DATABASE BACKUP CONTROLFILE TO" and found they were different (BTW,
> no database structure changes were made during this whole process).
Starting from 8i, the incremental checkpoint feature makes CKPT process to update controlfile every 3 seconds anyway (in addition to possible redolog record updates during logswitch and updates during full checkpoint etc).
> I am curious and would like to know: In what situation "cp controlfile"
> method would prevent me from doing a "COMPLETE RECOVERY"? Would a db
> structure change (during hot backup) make "cp controlfile" method not
> working?
In the situation where Oracle simply says that your controlfile is corrupt
and it can't open it.
Btw, Oracle controlfiles store old-images of the blocks in them for crash
recovery, that way they survive from regular instance failures, but I
definitely don't recommend backing up a mounted controlfile by OS utilities
(a complete atomic snapshot of the whole database being a rare exception).
Tanel.
-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Tue Aug 03 2004 - 11:21:43 CDT
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