二、执行改表操作
mysql> ALTER TABLE employees.employees ADD COLUMN middle_name varchar(14) AFTER first_name;
Query OK, 0 rows affected (9.27 sec)
Records: 0 Duplicates: 0 Warnings: 0
三、查看改表进度
mysql> SELECT EVENT_NAME, WORK_COMPLETED, WORK_ESTIMATED FROM events_stages_current;
+------------------------------------------------------+----------------+----------------+
| EVENT_NAME | WORK_COMPLETED | WORK_ESTIMATED |
+------------------------------------------------------+----------------+----------------+
| stage/innodb/alter table (read PK and internal sort) | 280 | 1245 |
+------------------------------------------------------+----------------+----------------+
1 row in set (0.01 sec)关于MySQL Online DDL
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