gdb writer, how to update only changes

I'm getting confused when writing to a gdb with regard to feature operation parameters. The options are Insert, Update, Delete, and fme_db_operation. What I am looking to do is write only changes. Add rows if required, subtract rows if required, modify rows if required, and no modifications to unchanged rows. In other words, compare tables, then update only changes. It is not clear to me in the documentation that any one parameter does this. Let me know.

Thank you,

Tyler

FME Workbench 2020.2