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Home -> Community -> Mailing Lists -> Oracle-L -> RE: RE: Stand-by (Oracle9i Data Guard) vs. Replication
Thanks for your thoughts Dick! Actually, look into Data Guard in 9i and you
will find that you are no longer constrained by archive log switches!! I'm
really concerned with the conflict resolution issues with MM Replication.
I've done something like this once before, with only 2 sites, but it's been
so long that it's a hazy distant memory. As I recall, the conflict
resolution was a bear.
They are intending on doing the resolution based on a date column and just saying that the latest date winds... they have a method of keeping the date/time on the servers in sync as long as the network is up, but my concern is what happens when it goes down and that date/time sync no longer is working.... or what happens when the system goes down and they also replace the hardware and the date/time is not sync'd for several days until the network is back.
But... then I ask myself how often that will happen too... ;-)
Robert G. Freeman - Oracle8i OCP
Oracle DBA Technical Lead
CSX Midtier Database Administration
The Cigarette Smoking Man: Anyone who can appease a man's conscience can take his freedom away from him.
-----Original Message-----
Sent: Monday, March 25, 2002 2:37 PM
To: Freeman, Robert ; Multiple recipients of list ORACLE-L
Robert,
Given what you've said it would appear that your only choice is going to
be
symetric/advanced replication, multi-master. The conflict resolution rules
may
be a bear to set up with 5 sites though. Using a standby db would not be
very
effective since data updates are dependent on the archive log switch points
and
that does not address the different sites if your reason for failure is a
network related one. Snapshots won't work either since they are read only.
Dick Goulet
____________________Reply Separator____________________ Author: "Freeman; Robert " <Robert_Freeman_at_csx.com> Date: 3/25/2002 9:48 AM
Pretty stringent. They want as little latency as possible. Changes at a master should be available to all sites ASAP. Now, they could all go to one central site, and thats ok as long as our networking is healthy, but if it goes down, there is a requirement that they be able to work independently (there are 4-5 sites) and then all changes need to be synchronized. Data loss is secondary to availability however.
These requirements smack of trouble to me.
Robert G. Freeman - Oracle8i OCP
Oracle DBA Technical Lead
CSX Midtier Database Administration
The Cigarette Smoking Man: Anyone who can appease a man's conscience can take his freedom away from him.
-----Original Message-----
Sent: Monday, March 25, 2002 11:48 AM
To: Multiple recipients of list ORACLE-L
What type of requirement or SLA do you have in regards to keeping the instances in sync?
-Joe
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Joe Raube INET: jraube_at_yahoo.com 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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Freeman, Robert INET: Robert_Freeman_at_csx.com 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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Freeman, Robert INET: Robert_Freeman_at_csx.com 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 Mon Mar 25 2002 - 13:53:32 CST
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