Effective in Informatica 10.0, when you redeploy an application, the “Retain state information” check box allows you to choose to retain the current state of run-time objects that are part of the deployed application. The state refers to mapping properties and the properties of run-time objects such as Sequence Generator Transformations.
Previously, the Deploy dialog box gave you a choice of “Update” or “Replace.” The “Retain state information” check box replaces the “Update” check box, and is selected by default.
If you select "Retain state information," you retain run-time settings and properties in the deployed application. If you clear “Retain state information,” you discard the state of these settings and properties in the deployed application.