zfheapsz is the number of bytes InterSystems IRIS allocates for the $ZF heap for all purposes. The $ZF heap consists of the total number of bytes allocated in virtual memory for all $ZF input and output parameters, including the space for strings allowed by the first value. The range is 0–270336 bytes. The default is 0. A value of 0 tells InterSystems IRIS to calculate an appropriate value for
zfheapsz automatically, based on the value of
zfstrsz.