How can you recover a session if it failed in the middle of the process?

With out using Informatica recovery process, how can you recover if session failed due to some server crash or with any other reason? With out using any informatica recovery procedures?

If source is flat file containing 2million rows using target(Data Base) based commit. Session got failed after processing 1million rows due some reason like server gone down or etc. I would like to restart my session from where it stopped or failed with out using Informatica Recovery process.