Re: shared database sequence.

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."

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