mysql> SET FOREIGN_KEY_CHECKS = 0; 修改KEY值，使此库变为可直接删除状态
Query OK, 0 rows affected (0.00 sec)
mysql> delete from instances where uuid="3ab73261-82ce-4b9a-9a1c-519624e19dc2";
Query OK, 1 row affected (0.03 sec)
mysql> SET FOREIGN_KEY_CHECKS = 1; 删除后，修改KEY值，使此库变为不可直接删除状态
Query OK, 0 rows affected (0.00 sec)
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