Where is actual work done - app server or DB server?

I am executing SSIS packages from an application server that is different than the database server. This package will be reading and writing files. Is it better to have the potentially large input files on the DB server or the application server where the package is executed? I'm not clear on where the actual "work" takes place when I execute a package on a server other tha开发者_Python百科n the database server.

The Integration Services server is where the actual execution is done. Generally that means "the DB server" but it doesn't always have to be the same server that the houses the DB you are reading from/writing to.

"This package will be reading and writing files."

isnt that one of the specialities of a database server? ;)