Re: shared database sequence.

Carel,

In our case it is little bit different. We are going to use both databse
actively, I mean, sharing the load balance between the two databases and it
is like two phase commit.
A company called GOLDEN GATE, giving us the proof of concept(POC)
implementing the above.

Jaffar


On 2/27/07, Carel-Jan Engel <cjpengel.dbalert@xxxxxxxxx> wrote:


Actually, one of my CT is doing this in a high transaction volume HA
solution.
No Data Guard (no RAC!), simply balance the load at two production
servers, sitting at 20m distance.
They asynchronously forward the transactions to the 'other' server.
If one server is lost, the other can deal with the load. Switching the
user-apps to another server is split-second work. The amount of transactions
that can get lost costs less (in the meaning of USD) than an expensive
RAC/DG and what have you solution. Perfect business case, perfect solution.
Truly HA by design. I like it.

  Best regards,

Carel-Jan Engel

===
If you think education is expensive, try ignorance. (Derek Bok)
===


On Mon, 2007-02-26 at 23:05 +0300, Syed Jaffar Hussain wrote:

Thanks for all your suggestions.

I guess having separate sequences with odd and event sequence numbers
would going to work.
The scenario is like to have two databases one at local site and another
at remote site (not at far distance) and replicate the information or sync
the data between two databases actively. Its very highly OLTP with more than
400 transaction per second. Therefore, synonym or getting nexval through
dblink would  probably is not acceptable.

Regards

Jaffar

On 2/26/07, *EPS - DBA (Group)* <dbamail@xxxxxxxxxxxxxxxxxxxxx> wrote:

 Would this work?



 A really simple, not so elegant solution would be to have a sequence
generator on each database



 DB#1  start with 1 increment by 2 (generates only odd sequence numbers)

 DB#2 start with 2 increment by 2 (generates only even sequence numbers)






  ------------------------------

*From:* oracle-l-bounce@xxxxxxxxxxxxx [mailto:
oracle-l-bounce@xxxxxxxxxxxxx] *On Behalf Of *Mark W. Farnham
*Sent:* Monday, February 26, 2007 10:47 AM
*To:* sjaffarhussain@xxxxxxxxx; 'oracle-l'
*Subject:* RE: shared database sequence.


  Do you just need uniqueness or do you need some correspondence amongst
the databases?



If so, how chunky can the correspondence be?



If the database servers are reliably near each other in a network latency
sense you would still have to decide whether the network latency of using a
dblink to get sequence numbers from a different database is acceptable.



If you don't need a correspondence, then you can maintain uniqueness by
assigning something like a database number to each database and tacking a
suffix on, so for example all the ids from database 3 end in 3.



mwf



   ------------------------------

  *From:* oracle-l-bounce@xxxxxxxxxxxxx [mailto:
oracle-l-bounce@xxxxxxxxxxxxx] *On Behalf Of *Syed Jaffar Hussain
*Sent:* Monday, February 26, 2007 4:14 AM
*To:* oracle-l
*Subject:* shared database sequence.




  Hello List,





  Is it possible to share a database sequence between multiple databases?
Not in RAC of course.


  We are planning to have two databses exchanging information
(replicating) using third party solution. But, stuck with the issues of
sequences.





  Thanks
--
Best Regards,
Syed Jaffar Hussain
Oracle ACE
8i,9i & 10g OCP DBA

http://jaffardba.blogspot.com/
http://www.oracle.com/technology/community/oracle_ace/ace1.html#hussain

----------------------------------------------------------------------------------
"Winners don't do different things. They do things differently."





--
Best Regards,
Syed Jaffar Hussain
Oracle ACE
8i,9i & 10g OCP DBA

http://jaffardba.blogspot.com/
http://www.oracle.com/technology/community/oracle_ace/ace1.html#hussain

----------------------------------------------------------------------------------
"Winners don't do different things. They do things differently."






--
Best Regards,
Syed Jaffar Hussain
Oracle ACE
8i,9i & 10g OCP DBA

http://jaffardba.blogspot.com/
http://www.oracle.com/technology/community/oracle_ace/ace1.html#hussain
----------------------------------------------------------------------------------
"Winners don't do different things. They do things differently."

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