Db2 High Performance Unload

The architecture of Db2 High Performance Unload (HPU) is designed for high-speed data extraction from Db2 databases on z/OS. The main components include: 1. **HPU Engine:** This is the core component responsible for managing the unload process.

It handles the parallel processing of data extraction, reads data from Db2 tablespaces, and coordinates the overall operation. 2. **Control Card Processor:** This component parses and interprets the control cards provided in the `SYSIN` DD statement.

It validates the parameters, sets up the environment, and configures the unload process based on the user-defined options. 3. **Output Writer:** This component formats and writes the extracted data to the specified output datasets.

It supports various output formats, such as DELIMITED, and XML, and handles data formatting and compression. 4. **Db2 Interface:** HPU interacts with Db2 through standard SQL interfaces.

This allows HPU to access data from Db2 tablespaces and retrieve metadata from Db2 catalog tables. 5. **Resource Manager:** This component manages system resources, such as memory and I/O, to optimize the performance of the unload process.

These components communicate through various mechanisms: * The Control Card Processor passes configuration parameters to the HPU Engine. * The HPU Engine interacts with Db2 through SQL interfaces to retrieve data. * The HPU Engine passes data to the Output Writer for formatting and writing to output datasets.

* The Resource Manager coordinates resource allocation for all components. HPU uses Db2 databases as the source of data. The data is read from Db2 tablespaces.

The output data is written to datasets specified in the JCL. These datasets can be sequential files, partitioned datasets, or other supported storage mechanisms. HPU does not require any specific network ports.

Communication with Db2 occurs through standard Db2 interfaces, which typically do not require specific network configurations within the z/OS environment. The JCL job submission is the primary interface for HPU. Configuration parameters are specified in the `SYSIN` DD statement.

Monitoring is done via SYSPRINT and SYSOUT datasets. HPU supports RACF for authentication and authorization. Audit logging is provided through the SYSPRINT output.