How to change the value of the max_allowed_packet parameter?

Question

MySQL

When installing on the OTRS server, it gives an
Error: Make sure that your DBMS accepts packages larger than 20 MB (the current value of the package size is up to 1 MB). Change the value of the max_allowed_packet parameter for your DBMS to avoid errors.

The question is how to make settings in the PuTTY terminal?
Ps I'm encountering server management for the first time, please explain to the teapot how to do it step by step ....

Answer 1

mysql> SET GLOBAL max_allowed_packet=268435456;