Execution Engine

Execution Plan

For a client of the ExecutionEngine to be able to formally describe the plan that he wants to execute, the constructs offered by the Execution Plan are used. These constructs have the following main pillars.

• Configuration

  Every plan is potentially one execution unit for the execution engine. Each plan while executing can request different parametrization.

• Variables

  Tha variables defined in a plan are the common data placeholders through which the elements of the plan exchange data.

  • Data Types

    Each variable is typed and this type describes the different characteristics of the data exchanged.

  • Parameters

    Each variable is accessed through defined parameters. Parameters are distinguished by their direction and processing.

    • Filters

      Each parameter can provide either direct access to its underlying data or perform a number of elaborate filtering tasks before retrieving or storing data to its underlying Parameter and Data Type

• Execution Tree

  The plan hierarchy is composed of a number of elements that control the flow and the actions of the plan