How can we update a record in target table without using Update strategy

How can we update a record in target table without using Update strategy :

A target table can be updated without using 'Update Strategy'. For this, we need to define the key in the target table in Informatica level and then we need to connect the key and the field we want to update in the mapping Target. In the session level, we should set the target property as "Update as Update" and check the "Update" check-box.
Let's assume we have a target table "Customer" with fields as "Customer ID", "Customer Name" and "Customer Address". Suppose we want to update "Customer Address" without an Update Strategy. Then we have to define "Customer ID" as primary key in Informatica level and we will have to connect Customer ID and Customer Address fields in the mapping. If the session properties are set correctly as described above, then the mapping will only update the customer address field for all matching customer IDs.

Under what condition selecting Sorted Input in aggregator may fail the session :

1.  If the input data is not sorted correctly, the session will fail.
2. Also if the input data is properly sorted, the session may fail if the sort order by ports and the   group by ports of the aggregator are not in the same order

Why is Sorter an Active Transformation :

 

When the Sorter transformation is configured to treat output rows as distinct, it assigns all ports as part of the sort key. The Integration Service discards duplicate rows compared during the sort operation. The number of Input Rows will vary as compared with the Output rows and hence it is an Active transformation