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Home -> Community -> Mailing Lists -> Oracle-L -> RE: A RMAN question
Hi Dennis,
Thanks for replying. I guess I have not been able to make my question clear. You see, I need to backup only the cloned database on server B and NOT the database on server A. My scenario is as follows :
The main db on server A is a partitioned data warehouse system and we r
planning to copy over the data files and the control files every night to
the cloned db on server B. Thereafter, we will b taking a RMAN backup of
the
cloned db on server B only.
As I said, RMAN writes the backup info on the target database's control
files
when it takes the backup. I also said that we plan to take a full backup on
Sundays and incremental backup on the other days.
My confusion was :
Say, RMAN takes a backup of the database on the cloned db on server B on a Monday. On MOnday night as per procedure, the control files and the database files from the main db on server A are copied over to server B. On Tuesday, will RMAN b happy taking the incremental backup again of the cloned db on server B even though it finds that the control files r different than the ones it wrote the backup info to the previous day ?? Or will it get confused and prompt for a FULL backup ??
Any ideas from anybody would b appreciated a lot.
Regards,
Samir
Samir Sarkar
Oracle DBA
SchlumbergerSema
Email : samir.sarkar_at_nottingham.sema.slb.com
ssarkar2_at_slb.com
Phone : +44 (0) 115 - 957 6028
EPABX : +44 (0) 115 - 957 6418 Ext. 76028
Fax : +44 (0) 115 - 957 6018
-----Original Message-----
Sent: 20 March 2002 19:16
To: Multiple recipients of list ORACLE-L
Samir - We have found that each Oracle database has an internal ID. This ID doesn't change when you clone it as you describe. RMAN uses this ID, and will become confused if it sees two databases that are identical. One way around this is to run two RMAN catalogs. I have not considered it an advantage to use RMAN with the control file (non-catalog) option, so I haven't considered all the ramifications there.
Have you looked at the RMAN DUPLICATE command to clone the database?
Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Wednesday, March 20, 2002 10:14 AM
To: Multiple recipients of list ORACLE-L
Hi All,
Though I have been using RMAN for quite a while now, I would like to ask for
a clarification
here.
We have a production database with partitioning options on server A. We
copy over the files
(including the control files) of the prod database each night to a server B.
We will then be using
RMAN to backup the database on server. We intend to take a Full backup on
Sundays and Incrementals
on all weekdays.
I know that when we take a RMAN backup, it writes information about that
task to the target database's
control files which is precisely why we need not have a catalog database
necessarily.
My question is when RMAN takes a backup once, will it return an error when
tries to take an
incremental backup a second time since we have replaced the control files
overnight ?? I mean,
will RMAN be happy with taking an INCREMENTAL backup of the database even if
it finds that the
control files on which it had written the backup info the previous night
have been replaced with a
new set of control files ?? Will it prompt for a full backup ???
Any help will be greatly appreciated.
Regards,
Samir
Samir Sarkar
Oracle DBA
SchlumbergerSema
Email : samir.sarkar_at_nottingham.sema.slb.com
ssarkar2_at_slb.com
Phone : +44 (0) 115 - 957 6028
EPABX : +44 (0) 115 - 957 6418 Ext. 76028
Fax : +44 (0) 115 - 957 6018
If you have received this email in error please notify the SchlumbergerSema Helpdesk by telephone on +44 (0) 121 627 5600.
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: SARKAR, Samir
INET: Samir.SARKAR_at_nottingham.sema.slb.com
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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: ListGuru_at_fatcity.com (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). Received on Thu Mar 21 2002 - 02:38:19 CST
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