2、数据库变量（参数）管理

查看变量方法

查看全局级别的系统变量show global variables \G;#查看所有跟"版本”相关的属性值show global variables like '%version%'\G;#查看字符集相关的全局设置show global variables where variable_name like 'character%';#查看某些日志是否开启或关闭show global variables where variable_name like '%log%' and vale='off';

查看会话级别的参数值show session variables \G;show variables;

其他语法select @@[global.|session.]system_var_nameselect @@global.pid_files;select @@session.warning_count;

修改变量值/设定变量值

SET GLOBAL var_name = value;SET @@GLOBAL.var_name = value;SET SESSION var_name = value;SET @@SESSION.var_name = value;