Saroj,
Oracle does two things when you issue the start backup command. 1) It
freezes the SCN in the header block of all datafiles in that tablespace and 2)
it begins writing full block redo, from my experience for all tablespaces in the
database. Some folks, including Oracle themselves, do not recommend putting the
entire database into hotbackup mode at one time. There are varying reasons for
that & we could probably start a 'holy war' on the subject. But I do it all the
time as it does make recovery a little simpler to fathom and it makes matters on
my SA's easier to manage. The scenario I follow is a) put all of the
tablespaces into backup mode, b) back up all of the datafiles followed by the
control file(s), c) end the backup, d) backup all of the archive redo logs. Now
you've got a set of data files that can be used to restore to a replacement
system, almost (but not exactly) like you had a cold backup.
Dick Goulet
____________________Reply Separator____________________
Author: "Dash; Saroj (CAP;CEF)" <[EMAIL PROTECTED]>
Date: 10/2/2001 2:30 AM
Hello All,
When you take begin back up of tablespace what exactly oracle does
internally.
what happen the transcation in that period.
Please tell me .
Regards,
saroj.
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