Guy,
I would have thought 2) was best as you are reducing the concurrency (I think that is the right word) of redo log activity.
As each tablespace is in backup mode it writes the full block to the redo log when any changes are made. On the assumption that all tablespaces are being written (albeit infrequently) during the period of hot backup it is better to alter each tablespace, copy it then alter online again so that only 1 tablespace at a time is having full blocks of changed data writing to the redo logs.
The overall level of redo will be the same but contention (ah ha - better word) will be reduced
John
-----Original Message-----
From: Guy Hammond [mailto:[EMAIL PROTECTED]]
Sent: 02 October 01 12:15
To: Multiple recipients of list ORACLE-L
Subject: RE: Hot Backup Issue
Hello,
Slightly unrelated question... is it better to (in pseudo code) :
1)
for each tablespace loop
put tablespace in backup mode
end loop
for each datafile in the database loop
copy data file
end loop
for each tablespace loop
put tablespace in normal mode
end loop
or 2)
for each tablespace loop
put tablespace in backup mode
for each datafile in this tablespace loop
copy data file
end loop
put tablespace in normal mode
end loop
What I'm doing is (2), but I notice that Rajesh is doing (1). What are
the pros and cons of each approach? (I'll probably use RMAN at some
point, anyway :0) ).
Cheers,
g
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Guy Hammond
INET: [EMAIL PROTECTED]
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
**********************************************************************
This email and any attachments may be confidential and the subject of
legal professional privilege. Any disclosure, use, storage or copying
of this email without the consent of the sender is strictly prohibited.
Please notify the sender immediately if you are not the intended
recipient and then delete the email from your inbox and do not
disclose the contents to another person, use, copy or store the
information in any medium.
**********************************************************************
