Describing a logical data store
A logical data store represents the use of data via application systems without considering how their access will be concretely implemented.
In a logical application system structure diagram, you can use only the local or external RE data stores.
A logical application system is an assembly of other logical application systems, logical applications and end users interacting with application components to implement one or several functions.
A logical application is a component of an application that is available to the end user of this application in the context of his/her work. Logical applications represent the split of an application into its basic functional units. A logical application is a consistent, indivisible unit of processing that coordinates a set of messages and events in order to perform a task in the information system. In the application system, the logical application is the most basic functional unit.
Creating a local logical data store
A local data store represents a data store used only inside the system described.
To create, for example, a local logical data store based on a logical application system structure diagram:
1. Open the diagram that interests you.
2. In the application system structure diagram insert toolbar, click Local Logical Data Store.
3. Click in the frame of the described logical application system.
A creation dialog box prompts you to select the RE Data Logical Store Structure. This is the RE physical structure that will concretely support the database.
4. Select an existing RE logical data domain, or create a new application system.
5. Click OK.
The local logical data store appears in the diagram with the name of the RE logical data domain.
An RE logical data store structure is held by a package.
Describing access to a logical data store
The following components can access a logical data store with read and write access:
• logical application system uses
The use of a logical application system describes the role of a logical application system in a composition relationship with a parent application system or in a logical application system environment.
• The logical application components representing the logical applications used in the context of the described logical application system.
A logical application component describes the role of a logical application in a composition relationship with a parent logical application or a logical application system.
To create read access to the logical data store:
1. In the diagram insert toolbar, click Link.
2. Draw a link between the data store and the entity that reads the data (logical application component or logical application system use).
A Read-only access to data storage is automatically created with the link from the data store to the entity.
To create a link with write access, you must draw a link between this entity and the data store to which it has write access. A
Write access to data storage is then automatically created.