What is the purpose of the ztta/roll area profile parameter?

1.	What is the purpose of the ztta/roll area profile parameter?
Answer» The size of the roll area in BYTES is specified by this VALUE. The roll area is one of several memory locations that respond to user program demands. However, for technical reasons, the first 250 KB or so of a user context are always stored in the roll area, with additional data - up to the roll area limit ztta/roll first, - in extended memory, up to the limit ztta/roll extension or if extended memory is exhausted, then - again in the roll area, until the roll area is full, then - in the local process area, up to the limit abap/heap area. Then there's a crash with errors like STORAGE PARAMETERS WRONG SET, which indicates a memory bottleneck. With context changes, there is a MINIMUM amount of data transmission; nonetheless, the increase helps to avoid difficulties (address space, swap space, operating system PAGING).

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