set global read_only=0; 关闭只读,可以读写 set global read_only=1; 开始只读模式

mysql> set global read_only=0;
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like '%read_only%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| innodb_read_only | OFF   |
| read_only        | OFF   |
| tx_read_only     | OFF   |
+------------------+-------+
3 rows in set (0.00 sec)

mysql> set global read_only=1;
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like '%read_only%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| innodb_read_only | OFF   |
| read_only        | ON    |
| tx_read_only     | OFF   |
+------------------+-------+
3 rows in set (0.00 sec)

set global read_only=0;  关闭只读,可以读写

 set global read_only=1; 开始只读模式