expr| dev.mysql.com
7.1.9.3 Persisted System Variables| dev.mysql.com
7.1.9.4 Nonpersistible and Persist-Restricted System Variables| dev.mysql.com
7.1.9.2 Dynamic System Variables| dev.mysql.com
System Variable Assignment| dev.mysql.com
7.1.8 Server System Variables| dev.mysql.com
7.1.9.1 System Variable Privileges| dev.mysql.com