Solution 1

Upgrade your MySql server. After the upgrade reboot the server

mysql_upgrade -u root -p --force
systemctl restart mysqld

 

Solution 2

This solution is not permanent. After the next reboot of the MySql server all changes will be lost.

mysql -u app -p
mysql> set @@global.show_compatibility_56=ON;

 

Solution 3

This solution is permanent. Locate and edit your MySql config file: my.cnf

Under the [mysqld] config section add the following line:

show_compatibility_56 = ON


Sample:

[mysqld]
port = 3306
show_compatibility_56 = ON
performance_schema=ON


Restart your MySql Server



NOTES:

show_compatibility_56 is deprecated because its only purpose is to permit control over deprecated system and status variable information sources that will be removed in a future MySQL release. When those sources are removed, show_compatibility_56 will have no purpose and will be removed as well.

Reference: https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_show_compatibility_56