How to set the value of max_allowed_packet or wait_timeout for MySQL on Plesk server?

Set the max_allowed_packet or wait_timeout value in
[mysqld]
and
[mysqldump]
sections of
my.cnf file.

• For Debian/Ubuntu:

  /etc/mysql/my.cnf

• For CentOS/RHEL/CloudLinux:

  /etc/my.cnf

[mysqld]
 wait_timeout = 31536000
 max_allowed_packet=32M
 ....
 [mysqldump]
 max_allowed_packet=32M

Restart MySQL service:

# service mysql restart || service mariadb restart || service mysqld restart 

Set the max_allowed_packet or wait_timeout value in
[mysqld]
and
[mysqldump]
sections of %plesk_dir%DatabasesMySQLmy.ini file.

[mysqld]
 wait_timeout = 31536000
 max_allowed_packet=32M
 ....
 [mysqldump]
 max_allowed_packet=32M

Note: wait_timeout=31536000 is the maximum supported value in MySQL server.