problem in call transaction method/session method

Hi all,

suppose we are uploading 10,000 records to SAP through call transaction or session. suppose we found from 3000 -5000 records contain errors how do we process them with out manual interaction (modification) in both methods.

2>why do we use session method for large data processing and why do we use call transaction method for small amount of data .

please let me know the differences

thanks in advance.