or you can use the logical standby feature of 9.2 and then have both
databases open.
Replication bothers me when I start to think about synchronous vs
asynchronous. Async doesn't "hold up" the primary site from continuing
on, but the databases are not true copies of one another. Sync are true
copies but you can hold up the commit waiting for a return from the
remote site.
And if it fails, it's messy to clean up
- John Weatherman <john.weatherman_at_replacements.com> wrote:
> 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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Received on Fri Jun 14 2002 - 13:57:25 CDT
