Data and system flow of DEDB Unload

The unload processor (FABCUR1) is a z/OS® batch program that controls and manages the unloading of one or more DEDB areas to QSAM data sets. It achieves significant performance improvements (that is, reduced elapsed time) by implementing a parallel processing environment and by reducing the number of EXCPs issued.

If you enable the IMS catalog and the IMS management of ACBs, ACB definitions are retrieved from the IMS directory instead of from OLDACB and NEWACB libraries.

The following figure shows the flow of the unload procedure.

Figure 1. Flow of Unload
This figure depicts the process flow of the unload procedure. Input consists of the SYSIN data set, the ACBs, and DEDB areas. Output consists of the messages, reports, and QSAM data sets.

Load modules

Among the DEDB Unload/Reload modules, two are used for unload. The following table lists these modules.

Table 1. Load modules of DEDB Unload
Load module name Function
FABCUR1 Controls and manages unload processing
FABCUR1U Subtask to extract segment data