How applications generally connect to database?

 1. When application try to connect, uses Config file (Configuration file--Resides in application server). Config file (.txt) should contains SQL Server instance name + user name [service account name--DBA team should add the account into SQL Server under security] + Password [Strong]

Application use all these details from Config file and point connection to SQL server database

Real time points:

> Any business 2 data centers maintains called PRODUCTION and DR data center.

> Always distance between data centers should not be more than 50 KM.

> Few people always work inside the data centers.

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