[Mysql] increment step adjustment

mysql> show variables like '%increment%';
+-----------------------------+-------+
| Variable_name               | Value |
+-----------------------------+-------+
| auto_increment_increment    | 2     |
| auto_increment_offset       | 1     |
| div_precision_increment     | 4     |
| innodb_autoextend_increment | 64    |
+-----------------------------+-------+
4 rows in set (0.03 sec)

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

mysql> show variables like '%increment%';
+-----------------------------+-------+
| Variable_name               | Value |
+-----------------------------+-------+
| auto_increment_increment    | 2     |
| auto_increment_offset       | 1     |
| div_precision_increment     | 4     |
| innodb_autoextend_increment | 64    |
+-----------------------------+-------+
4 rows in set (0.07 sec)

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

mysql> 
mysql> show variables like '%increment%';
+-----------------------------+-------+
| Variable_name               | Value |
+-----------------------------+-------+
| auto_increment_increment    | 1     |
| auto_increment_offset       | 1     |
| div_precision_increment     | 4     |
| innodb_autoextend_increment | 64    |
+-----------------------------+-------+
4 rows in set (0.04 sec)