SSIS or SQL Server Integration Services (SSIS) is a component of Microsoft SQL Server, which can be used to accomplish a broad range of data migration tasks.
What will be your first approach if the package that runs fine in Business Intelligence Development Studio (BIDS) but fails when running from an SQL agent job?
The account that runs SQL Agent Jobs might not have the required permission for one of the connections in your package. In such cases, either you can create a proxy account or elevate the account permissions.
Different types of connection that work within SSIS are ODBC OLEDB .net SQLClient Flat File Excel XML
Variable in SSIS is basically used to store values. In SSIS, there are two types of variables system variable and user variable.