Modifying PSBs and PCBs
You can modify properties in a program specification blocks (PSB) statement and its associated program communication block (PCB) statements by using the PSB summary page and the IMS PCB editor in IMS Explorer.
- Specifying an alternate PCB
An alternate PCB statement describes an alternate message destination where a message can be sent when the destination of a message differs from the place where it was entered. Use the alternate PCB statement section of the PSB summary page to create or modify an alternate PCB statement. - Creating or modifying full-function or Fast Path database PCBs
Use the full-function or Fast Path database PCB statement section of the PSB summary page to create or modify a full-function or Fast Path database PCB statement. - Creating or modifying GSAM database PCBs
Generalized sequential access method (GSAM) databases are sequentially organized databases that are designed to be compatible with z/OS® data sets. Use the GSAM database PCB statement section of the PSB summary page to create or alter a GSAM database PCB statement. The GSAM database PCB statement defines a view that controls how application programs can access the GSAM database. - Specifying PSB generation properties
Use the PSB generation statement section of the PSB summary page to specify property values for the PSBGEN statement, which describes the characteristics of an application program. - Specifying segment sensitivity
You can use the IMS PCB editor to define which segments an application program is sensitive to in the database program communication block (PCB) for the hierarchy that contains those segments. An IMS application program can access only data to which it is sensitive. Segment sensitivity can prevent an application program from accessing all the segments in a particular hierarchy. The sensitivity tells IMS which segments in a hierarchy the program is allowed to access. - Specifying field sensitivity
You can use the IMS PCB editor to define which fields an application program is sensitive to in the database program communication block (PCB) for the hierarchy that contains those fields. An IMS application program can access only data to which it is sensitive. Field sensitivity can prevent an application program from accessing all the fields in a particular hierarchy. The sensitivity tells IMS which fields in a hierarchy the program is allowed to access.
Parent topic: Working with IMS program definitions (PSB)
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