Mandatory for GETMAIN SHARED, it indicates the size of shared memory used for GETMAIN SHARED in unit of Mega-byte. Valid range is from 0 to 32768*1024. A value of 0 indicates no GETMAIN SHARED support. Since the overhead introduced by internal implementation mechanism, the actual memory size that can be used by user is less than the value indicated by KIX_SHR_SIZE.