Object Definitions and Instances
In order to use an object you must create both the object definition and an instance of it in a Work Area, and install the instance.
If you work in a Work Area, the system automatically creates both the definition and the instance at the same time.
The primary objects you define—Tables, Programs, Load Sets, Report Sets, Data Marts, and Workflows—contain secondary objects. For example, a Table contains Columns and Constraints, and a Program contains Source Code, Parameters, Table Descriptors, Planned Outputs, and Execution Templates.
Object instances also contain objects, notably Execution Setups and Mappings. See Object Ownership for further information.
Modifying Object Definitions: To modify an object definition, you must first check it out. Checking it out creates a new version of the definition—the one you are working on. No one else can check out the definition until you either check it in or undo the checkout. Existing versions of the object continue to function as before while you have the definition checked out. See Understanding Object Versions and Checkin/Checkout for further information.
The exception to this rule is Report Sets. Report Set definitions have a shared checkout system, so that after one user checks out a Report Set, anyone with the necessary security privileges on the Report Set can modify it. The system locks the sections people are working on to prevent conflicting modifications.
If you modify an object contained in the definition, the system implicitly checks out any secondary object you modify and implicitly checks it in again when you apply your changes. For example, if you check out a Program, modify and upload your Source Code, the system implicitly checks the Source Code out and then in again when you apply your changes.
Modifying Object Instances: Anyone with Modify privileges on an object instance can modify it without checking it out. However, when you click the Update button to begin modifying the object instance, the system creates a lock on the object so that no one else can modify it at the same time. The system also implicitly checks out the underlying object definition and increments its version number. When you click Apply, the system releases the lock and implicitly checks in the definition.
Parent topic: Object Definitions and Instances, and their Containers