16.20 - Setting Parameters for Shared Memory - Teradata Tools and Utilities

Teradata® Tools and Utilities for Linux Installation Guide Amazon Linux 2, CentOS, OEL, RedHat, SLES, Ubuntu

Teradata Tools and Utilities
Release Number
Release Date
November 2020
Content Type
Publication ID
English (United States)
The Teradata Parallel Transporter Base installation checks the values of the shared memory parameters for the required minimum values. If the value for a shared memory parameter is less than the minimum value, the installation recommends increasing the value to the minimum value.

The shmmni parameter determines the system-wide limit on the number of shared memory segments that can be created.

The shmmax parameter determines the maximum size of a shared memory segment. The minimum value is 4194304.

  1. Log on as the root user.
  2. Check the value of the shmmni parameter; the minimum value is 200:
    /sbin/sysctl kernel.shmmni
  3. Add the following line in the /etc/rc.d/rc.local file to increase the shmmni parameter value to 200:
    echo 200 > /proc/sys/kernel/shmmni
  4. To shut down the system in one minute, type:
    /sbin/shutdown -r +1