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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Replication question
Another potential HA use of AR is that you can use different platforms in an HA configuration. You can fail over to another platform with some idle capacity or a workload that can be shifted around until the failed services are restored.
Yet another is during planned downtime when upgrading Oracle and OS versions. You could upgrade the target while the source is the actively used node. Then move the users off the source and let the remaining changes post to the target. Now reverse the replication source/target roles and upgrade the old source (now they new target) an let it be until the next time. The outage should be shorter. The same technique could be used to roll back to a usable database after an major application change. Just change the target and let the users try things out. If there's a problem point them back to the source and regroup. It should be much quicker that undoing the changes.
Just some thoughts.
Tony Aponte
-----Original Message-----
Sent: Friday, June 14, 2002 2:19 PM
To: Multiple recipients of list ORACLE-L
Jarad,
A standby is simpler, however it has limited use for offloading some system load (opening for read access suspends roll forward, so the data is somewhat stale). By using Master-Master synchronous replication with good deadlock handlers, you can use BOTH instances so you get the benefit of not having an unused instance lying around (damagement hates that), but still have fail over available. Since you can have different users/locations attach to different instances, you also get some scalability advantages.
In general, I agree a standby is MUCH simpler.
John P Weatherman
Database Administrator
Replacements Ltd.
-----Original Message-----
Sent: Friday, June 14, 2002 1:41 PM
To: Multiple recipients of list ORACLE-L
Curious, that note suggests Advanced Replication as a failover methodology.
Seems that a standby database would be _much_ simpler.
Any thoughts ( from anyone ) on why one would use AR for failover, rather than using a standby database?
Jared
John Weatherman <john.weatherman_at_replacements.com>
Sent by: root_at_fatcity.com
06/14/2002 09:50 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
cc:
Subject: RE: Replication question
Mitchell,
There are a LOT of good papers in Metalink. I've been getting my own
education over the last few months. Replication is a really great swiss
army knife though, you need to do a little looking for what you
specifically
need to do, then test, test, test. Oh, and did I mention test? :) I
found
Note: 138181.1 particularly helpful. Oh, and plan on some TARs. I have
found Support very helpful/informative in this area.
Good Luck,
John P Weatherman
Database Administrator
Replacements Ltd.
-----Original Message-----
Sent: Friday, June 14, 2002 12:05 PM
To: Multiple recipients of list ORACLE-L
Hi all
I will work on replication soon. any advice for reference I can get.
Thanks in advance.
Mitchell
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Author: John Weatherman
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Author: Aponte, Tony
INET: AponteT_at_hsn.net
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 Fri Jun 14 2002 - 14:15:12 CDT
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