Application Restart Control for DB2

The architecture of ARC/DB2 and AR/VR on z/OS centers around the checkpoint facility and restart processing. Key components include the Checkpoint Manager, the Restart Manager, and the Db2 Interface. The Checkpoint Manager is responsible for inserting checkpoints into batch jobs and saving the application's state at predefined intervals.

The Restart Manager handles the restart process, utilizing the saved checkpoints to resume the job from the last successful point. The Db2 Interface facilitates communication with the Db2 database. These components interact through z/OS system calls and internal control blocks.

The checkpoint data is stored in a dedicated data set, and the restart process retrieves this data to restore the application's state. The products integrate with Db2 through standard Db2 APIs and utilities. There are no specific API endpoints exposed.

The communication protocol is based on z/OS system calls. The system does not use any specific ports or network requirements, as it operates within the z/OS environment. The primary storage mechanism is z/OS data sets.

The administrative interface is provided through standard z/OS consoles and utilities. User management is handled through z/OS security mechanisms. Configuration parameters include checkpoint frequency, data to be saved, and restart behavior.

Monitoring and logging are provided through z/OS system logs and product-specific reports. AR/VR extends this architecture to include VSAM recovery capabilities.