A parameter file specified at the workflow level provides a centralized mechanism to define values for parameters and variables used by all tasks within that workflow. These values override the initial or default values configured within the individual mappings and sessions. While a parameter file defined at the session level has higher precedence for that specific session, the workflow-level file serves as the default for any session that does not have its own file specified, thus overriding the pre-configured initial values.

A. In a default configuration, a workflow must contain at least one session task

A workflow is a container for various task types, such as Command, Email, or Timer tasks, and can be valid and functional without any Session tasks.

B. A workflow can contain multiple start points

A fundamental rule of workflow design in Informatica is that each workflow must have exactly one Start task, which serves as the single entry point for execution.

D. Another workflow cannot be executed from within a workflow

Informatica supports modular design; a workflow can execute another workflow by using a reusable Worklet task or by executing a pmcmd startworkflow command within a Command task.

1. Informatica PowerCenter 10.5 - Workflow Administration Guide

Chapter 10: Parameters and Variables

"Parameter File Precedence"

p. 178. This section details the hierarchy of parameter files. It clarifies that the Integration Service uses the workflow parameter file if a session-specific one is not defined. The values in the parameter file override the initial values of parameters and variables.

2. Informatica PowerCenter 10.5 - Workflow Basics Guide

Chapter 1: Workflow Basics

"Workflows"

p. 10. This section states

"All workflows must have a Start task. The Start task is the entry point into the workflow." This confirms that a workflow has a single start point.

3. Informatica PowerCenter 10.5 - Workflow Administration Guide

Chapter 1: Workflow and Task Basics

"Tasks"

p. 12. This page lists the different types of tasks that can be added to a workflow

including Command

Email

and Timer

demonstrating that a Session task is not mandatory.

4. Informatica PowerCenter 10.5 - Workflow Administration Guide

Chapter 8: Worklets

"Worklet Task"

p. 138. This chapter explains how a Worklet task can be used to run another workflow

directly refuting option D.