Architecture of an Integration Services Package

The objects that compose an Integration Services package include the following:

• The package itself
  The package, the unit of work that is retrieved, executed, and saved, and the most important Integration Services object.

  For more information, see Integration Services Packages.

• Control flow elements
  The control flow elements—tasks and containers—for building the control flow in a package. Control flow elements prepare or copy data, interact with other processes, or implement repeating workflow. Precedence constraints sequence the control flow elements into an ordered control flow and specify the conditions for executing tasks or containers.

  For more information, see Control Flow Elements.

• Data flow components
  The data flow components—sources, transformations, and destinations—for building data flows in a package that extract, transform, and load data. Paths sequence the data flow components into an ordered data flow.

  For more information, see Data Flow Elements.

• Connection managers
  The connection managers that connect to different types of data sources to extract and load data.

  For more information, see Integration Services Connections.

• Variables
  The variables that can be used in expressions to dynamically update column values and property expressions, control execution of repeating control flows, and define the conditions that precedence constraints apply.

  For more information, see Integration Services Variables.

• Event handlers
  The event handlers that run in response to the run-time events that packages, tasks, and containers raise.

  For more information, see Integration Services Event Handlers.

• Log providers
  The log providers that support logging of package run-time information such as the start time and the stop time of the package and its tasks and containers.

  For more information, see Integration Services Log Providers.