For Alpha Galaxy systems, GLX_SHM_REG is the number of shared
    memory region structures configured into the Galaxy Management
    Database (GMDB). If set to 0, the default number of shared memory
    regions are configured.

    If the condition value SS$_INSF_SHM_REG is returned for the
    $CRNMPSC_GDZRO_64 system service with the flag SEC$M_SHM_REG, the
    Galaxy shared memory code has run out of internal SHM_REG data
    structures. You need to increase the system parameter GLX_SHM_REG
    and reboot all Galaxy instances with this larger parameter value.