@milinaphalke Major work is at DBA end. As you are using Microsoft SQL, you might want to check how DR setup is configured, normally you setup Always On Availability which keeps your servers synchronized. If there are any DB jobs you have written, you need to update them as well.
On IIQ front, you need to update iiq.properties if there are any change to the DB URL, other wise that’ll not needed.
Based on your previous posts, you mentioned that you decided to go for upgrade due to some performance issues. Could you please specify what are those?