System Options under z/OS

MVARSIZE= System Option: z/OS

Specifies the maximum size for macro variables that are stored in memory.

Default:	8,192 bytes
Valid in:	configuration file, SAS invocation, OPTIONS statement, OPTIONS window
Category:	Macro: MACRO
PROC OPTIONS GROUP=	MACRO
z/OS specifics:	default values
See:	SAS Macro Language: Reference

MVARSIZE=n | nK | hexX | MIN | MAX

n | nK: specifies the maximum macro variable size in multiples of 1 (bytes) and 1,024 (kilobytes). You can specify decimal values for the number of kilobytes. For example, a value of 8 specifies 8 bytes, and a value of 0.782k specifies 801 bytes.
hexX: specifies the maximum macro variable size as a hexadecimal value. You must specify the value beginning with a number (0-9), followed by hexadecimal characters (0-9, A-F), and then followed by an X. For example, the value 2dx sets the maximum macro variable size to 45 bytes and a value of 0a0x sets the maximum macro variable size to 160 bytes.
MIN: sets maximum macro variable size to 0 and requires SAS to use the default value.
MAX: sets maximum macro variable size to 65,534.