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Home -> Community -> Mailing Lists -> Oracle-L -> RE: RE: RE: Stand-by (Oracle9i Data Guard) vs. Replication
>>1. Is the critical data would be updated in the sites..?
Yes... >> 2. If yes , are you expecting the other sites to 'see' this update...? Yes... >> 3. If one site is down, then are you expecting the other sites to sharethe >> load or you have the closest site in take in all the load...? Yes
but add this requirement as a wrinkle, the sites have to be able to run
independently of each other (e.g. a WAN failure) and then resync with each
other after a period of time. Finally, this is a bit different than Amazon
in that
this system has some human safety considerations associated with it. Amazon
outage might represent lost sales, outage of this system could represent
lost
lives. Needless to say, I'm being very careful about the architecture we
use.
I've implemented replication solutions before as well as stand-by database solutions. But the replication solutions to this point have been very simple and not nearly as complex... so I was hoping for someone to say, we do that and here are the issues we ran into.
As for RAC, we will be running RAC at each site, and replicating between the RAC cluster. Sites are way to distant for RAC between them through a SAN or some such thing.
RF
What does shareplex buy me that Oracle's advanced replication does not?
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: Tuesday, March 26, 2002 12:38 PM
To: Multiple recipients of list ORACLE-L
Robert,
If I understand your requirements correctly,
You have multiple sites separated geographically ( 200
Miles perhaps..?? ) and you are looking for a highly
available , 'Multimaster' kinda environment.
This kind of setup is common in
oh-don't-say-the-name-companies i.e. 'dot bombs' and
companies with regional offices around the world, with
certain variations.
I think off the top of the top of head I can say
Amazon as an example.
To clear some points before jumping to solutions,
1. Is the critical data would be updated in the
sites..?
2. If yes , are you expecting the other sites to 'see'
this update...?
3. If one site is down, then are you expecting the
other sites to share the load or you have the closest
site in take in all the load...?
Depending upon the answer you have to make a choice.
For example, I notice you have been discussing "RAC"
as a possible solution. In this case ,since you have
multiple sites , which is going to be the Primary..?
or are you proposing to use a "RAC" for each site..?
Wouldn't a third party assisted solution be more
scalable and cost effective..?
Like EMC or HP's XP storage solution has some kinda
'track' or 'Block' replicating mechanism between the
storage, which is extendable in term of geographical
location...?
Or if you are looking to share the load like in question 3 above, then wouldn't it be easy to Get a 'replicating' software to help replicate the data in real time or near real time...? Example , like said before quest software's shareplex. This can give you master-master replication capabilities.
Just my 2 cents.
Cheers,
RS
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Sakthi , Raj INET: rajan_sakthi_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).Received on Tue Mar 26 2002 - 12:29:10 CST
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