I would like to upgrade sdm 12.7 to sdm 12.9.It is in production server.It will affect any services in the sdm 12.7.
Hope you have got a chance to review chapter 2 "Upgrading " under implementation guide.
This has all the steps on how to plan your upgrade.
During the process your 12.7 environment will be unavailable.
As a best practice try to perform the task by building a test box using swing box, and try to upgrade it first. You should be able to get to know any possible issues which might likely occur on your production.
link for 12.9 Impl Guide:
Implementation Guide Release 12.9.00
Hi Mallick - We're you able to resolve using Vinod's suggestion? If so please mark his response as Correct Answer. Thanks! Chris