The default is A. For example, U abend occurs because segment codes have been added or deleted in the changed DBD. These program communication blocks PCBs represent message destinations and databases that are used by the application program. It is also possible for more than one message to be printed for each control statement. This parameter is required.

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The control statements must conform to the following guidelines: Commas, parentheses, and blanks can be used only as delimiting characters. Upon entry to the application program used for message processing, a PCB pointer to the psbllb of the input message is provided as the first entry in a list of PCB address pointers.

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In addition, there must be a statement that supplies the characteristics of the application program itself. To continue a statement, enter a non-blank character in column 72 and begin the statement on the next line starting in column The ACB generation procedure uses the following symbolic variables: The following relationships exist:. In this case, they follow each other on the output listing. These statements are called alternate PCBs, and they are used in message processing, batch message processing, and Fast Path programs that interface with the IMS message queues.

The operation field must be preceded and followed by one or more blanks.

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These statements are used with message, batch, and Fast Path processing programs to define logical data structures. For example, U abend occurs because segment codes have been added or psbblib in the changed DBD.

Output messages and statistics PSB generation produces three types of printed output and one load module, which becomes a member of the partitioned data set, IMS. The message can either refer to the control statement immediately preceding it or the preceding group of control statements.

The procedure shown in the following figure is created as a part of system definition.

The name of the PSB and its associated application program must be the same in a telecommunications system. Code Meaning 0 Successful completion of all operations 4 One or more warning messages issued 8 One or more blocks could not be built 16 Program terminated due to severe errors. The PCB address can represent the source of the input message, the destination for an output message, or a database. The Program Specification Block PSB Generation utility generates PSBs from macro instructions that describe the characteristics of application programs and the use of logical terminals and logical data structures.

This region size depends on the size of the blocks to be generated and typically varies from to KB. The six types of statements used for a PSB generation are: It is optional for the batch environment.

You can make additions, changes, and deletions to IMS. This parameter is required. The following figure illustrates the relationships between peblib physical databases, where A is the changed DBD.

Step 1 is a macro assembly execution that produces an object module. These program communication blocks PCBs represent message destinations and databases that are used by the application program.

The merge and expansion process is called block building. The following control statement is created as a part of system definition and is placed psbblib the Psblih. Regardless of what value is specified for the LRECL parameter, the utility always uses a record length of ACB Maintenance utility syntax: Diagnostics Errors discovered during the processing of control statement result in diagnostic messages being printed immediately following the image of the last control statement read before the error was discovered.

Use the Application Control Blocks ACB Maintenance utility to save instruction execution and direct-access wait time and psblb performance in application scheduling. The control statement can optionally contain a name, starting in column 1. Comments can be written following the last parameter of a control statement, separated from the parameter by one or more blanks.

ACB Maintenance utility input and output.