Hi,
We are planning for upgrade from sql server 2005 to sql server 2012, used sql server upgrade advisor and it shows no issues to upgrade. On the applications side, development team is also telling that the applications(they developed) will not fail with the new version. unfortunately there are some old applications that are in heavy use but our development team doesn't have their source code, and their vendors are also out of scence now, and those are working very smoothly with sql server 2005.
In the testing there is no problem but when we will go for the production may be we face some problem (it is not sure) and a rollback might be the option.
To apply this upgrade we must have a rollback plan (either it would be used or not).
Experts, please suggest some quick (instance have round 18 databases) and safe rollback plan.
Best Regards
khalil