What r the options in the target session of update strategy transsformatioin?

Update as Insert:
This option specified all the updaterecords from source to be flagged as inserts in the target.
In other words, instead of updating the records in the target they are inserted asnew
records.
Update else Insert:
This option enables informatica to flag the records either for update if they are old or insert, if they are new records from source.
insert,update,delete,insert as update,update else insert.update as update.