Persist a mapping output in a Mapping task. A Mapping task is an instance of the mapping in a workflow with the mapping configuration and parameter bindings. For more information about Mapping tasks, see the

Informatica Developer Workflow Guide

.

When you click the

Persistence

tab in the Mapping task

Properties

view, the Developer tool displays all the mapping outputs for the mapping. To persist any mapping output, enable

Persist

for the mapping output and select the type of aggregation to perform to return a persisted value.

When the Data Integration Service persists a mapping output in the Model repository, the Data Integration Service saves the mapping output with the Mapping task name as a key. For example, if a workflow contains four mapping tasks, each running the same mapping, the Data Integration Service saves four outputs in the Model repository.

When you persist a mapping output, you can configure a different aggregate function for the persisted value than the aggregate function you defined at the mapping level. The Data Integration Service generates more than one mapping output value. For example, the OrderDate mapping output might contain the MIN OrderDate. The persisted OrderDate mapping output might contain the MAX OrderDate.

You can bind the mapping output from a Mapping task to the input parameter of the Mapping task the next time it runs. Feedback binding is when you configure the results from one mapping run as input to the same mapping the next time it runs. You must persist the mapping output in a Mapping task to use it for feedback binding.

An example of feedback binding is to persist the latest order date that the mapping processes. The next time the Mapping task runs, the input parameter to the mapping is the last date processed. The mapping can filter the parameter source rows to include the rows with an order date greater than the last order date processed.

The following image shows the

Persistence

tab on the

Properties

view of the Mapping task:

The

Persistence

tab has the following fields: