Program specification block ims

Normally PCBs are two types. These statements allow specifying which segments and fields the application program can access. If segment defined as a sensitive, it will be accessible to the application. If segment not defined as a sensitive, it will be ignored by the application program.

PCB Defines the database to be accessed by the application program. The statement defines the type of operations allowed by the application program. Each database requires a its own PCB statement. If segment is defined as sensitive, all the segments in the path from the root to that segment must also be defined as sensitive.

These statements allow specifying which segments the application program can access. These statements allow specifying fields the application program can access. If fields defined as a sensitive, it will be accessible to the application.

If fields not defined as a sensitive, it will be ignored by the application program. Specifies defines the type of access to a database or segment. The program can process in the database. It defines the program's access to parts of the database and it is identified at the segment level. The program has access to all the fields within the segments to which it is sensitive. A program can also have field-level sensitivity. In this, we define a segment name and the parent name of the segment.

The LANG parameter specifies the language in which the application program is written, e. Access Control Blocks for an application program combines the Database Descriptor and the Program Specification Block into an executable form. For online programs, we need to pre-build ACBs. Previous Page. Next Page. Previous Page Print Page.

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