$ZSTRP[LLIM] provides a way for a process to limit its process private memory used for local variable and scratch storage. When the value is 0 or negative, the default, there is no limit. A positive value specifies a byte limit. When a request for additional memory exceeds the limit, GT.M does the expansion and then produces an STPCRIT error. By default, a later request for memory produces an STPOFLOW, unless subsequent to STPCRIT , $ZSTRPLLIM has been set to the same or higher limit. Note that GT.M allocates memory in large blocks so the interaction of $ZSTRPLLIM with memory growth is not exact. When the gtm_string_pool_limit environment variable specifies a positive value, GT.M uses it for the initial value of $ZSTRPLLIM.