MySQL自增ID耗尽实例讲解

显示定义ID

表定义的自增值ID达到上限后，在申请下一个ID时，得到的值保持不变

-- (2^32-1) = 4,294,967,295
-- 建议使用 BIGINT UNSIGNED
CREATE TABLE t (id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY) AUTO_INCREMENT=4294967295;
INSERT INTO t VALUES (null);

-- AUTO_INCREMENT没有改变
Mysql> SHOW CREATE TABLE t;
+-------+------------------------------------------------------+
| Table | Create Table           |
+-------+------------------------------------------------------+
| t  | CREATE TABLE `t` (
 `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4294967295 DEFAULT CHARSET=utf8 |
+-------+------------------------------------------------------+

mysql> INSERT INTO t VALUES (null);
ERROR 1062 (23000): Duplicate entry '4294967295' for key 'PRIMARY'