Update registration information on two databases at different physical locations

Update registration information on two databases at different physical locations

I would like to update two databases located at two different physical locations to be able to update the Registration information.


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This question depends too much on the actual database software in use. At a minimum, you should consider the case where one of the updates fails -- this usually requires wrapping the update statements in a transaction block that the database can roll back. This scenario can be implemented in many ways, depending on the software available. Here's some pseudocode -- 

BEGIN DISTRIBUTED TRANSACTION doubleup
UPDATE Table1SQLServer
   SET Registration = "foobar"
IF ERROR THEN
   ROLLBACK DISTRIBUTED TRANSACTION doubleup
UPDATE Table2Oracle
   SET Registration = "foobar"
IF ERROR THEN
   ROLLBACK DISTRIBUTED TRANSACTION doubleup
COMMIT DISTRIBUTED TRANSACTION doubleup

Check with your Database Administrator for specifics concerning your installation.

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This was first published in April 2001

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