R/3 Roll Area SAP

Definition

The roll area is a memory area with a set (configurable) size that belongs to a work process. It is located in the heap of the virtual address space of the work process.

Use

When the context of a work process changes, the data is copied from the roll area to a common resource called the roll file. To prevent repeated copying, the data is buffered in the roll buffer which is located in the shared memory.

Structure

The roll area consists of 2 segments. The first segment, which can be set with the parameter ztta/roll_first, is assigned to the work process first as memory. If this is used up, the work process has more memory assigned to it. The amount of memory is determined by the difference between the parameters ztta/roll_area and ztta/roll_first.

See:

Allocating Memory for User Contexts

Integration

For technical reasons, the roll area is always the first memory that a work process receives. Only afterwards can Extended Memory be requested.

See: Virtual Address Space of a Work Process