mysql - mysql保持并等待相同的锁

我正在与mysql5.6.34合作innoDB。发生了死锁，我得到了show engine innodb status的关注。我不知道死锁是如何发生的，为什么TRANSACTION-2保持并等待相同的X锁，然后ROLLBACK呢？
日志：

------------------------
LATEST DETECTED DEADLOCK
------------------------
2018-08-15 05:58:56 7fdff5872700
*** (1) TRANSACTION:
TRANSACTION 81567872, ACTIVE 0 sec inserting
mysql tables in use 1, locked 1
LOCK WAIT 4 lock struct(s), heap size 1184, 2 row lock(s), undo log entries 2
MySQL thread id 455326, OS thread handle 0x7fdff9083700, query id 255309181 10.8.201.34 slnbdata update
INSERT INTO XXX

*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 8065 page no 11084 n bits 192 index `PRIMARY` of table `XXX` trx id 81567872 lock_mode X insert intention waiting
Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0
 0: len 8; hex 73757072656d756d; asc supremum;;

*** (2) TRANSACTION:
TRANSACTION 81567879, ACTIVE 0 sec inserting
mysql tables in use 1, locked 1
4 lock struct(s), heap size 1184, 2 row lock(s), undo log entries 2
MySQL thread id 455338, OS thread handle 0x7fdff5872700, query id 255309187 10.8.201.34 slnbdata update
INSERT INTO XXX

*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 8065 page no 11084 n bits 192 index `PRIMARY` of table `XXX` trx id 81567879 lock_mode X
Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0
 0: len 8; hex 73757072656d756d; asc supremum;;

*** (2) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 8065 page no 11084 n bits 192 index `PRIMARY` of table `XXX` trx id 81567879 lock_mode X insert intention waiting
Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0
 0: len 8; hex 73757072656d756d; asc supremum;;

*** WE ROLL BACK TRANSACTION (2)
------------
TRANSACTIONS
------------

There do have a query before the insert:
SELECT
    pk_1,
    max(pk_2)
FROM
    table
WHERE
    pk_1 IN (...)
GROUP BY
    pk_1
but no queries between each insert.
And let me correct my reply above, the insert statement is:
insert into table_name(pk_1,pk_2 ...) values (1,1_1 ...) and insert into table_name(pk_1,pk_2 ...) values (2,2_1 ...)
We use foreach of mybatis like this:
   <insert id="save">
        <foreach collection="list" item="item" separator=";">
            INSERT INTO ...

CREATE TABLE `customer_address_info` (
  `customer_no` char(10) NOT NULL,
  `addr_index` int(1) unsigned NOT NULL,
  `addr_type` tinyint(1) NOT NULL,
  `province_code` char(6) DEFAULT NULL,
  `province_name` varchar(20) DEFAULT NULL,
  `city_code` char(6) DEFAULT NULL,
  `city_name` varchar(50) DEFAULT NULL,
  `county_code` char(6) DEFAULT NULL,
  `county_name` varchar(100) DEFAULT NULL,
  `zip_code` char(6) DEFAULT NULL,
  `detail` varchar(100) NOT NULL,
  `status` tinyint(4) unsigned NOT NULL,
  `create_date` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `create_user` varchar(30) NOT NULL,
  `modify_date` datetime DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
  `modify_user` varchar(30) DEFAULT NULL,
  PRIMARY KEY (`customer_no`,`addr_index`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

正如我评论的那样，发布的信息不足以查看完整图片并知道真正的原因。我将只分享我的两分钱。

Show ENGINE INNODB STATUS指示每个事务已锁定两行并具有两个未决的提交更改（2行锁定，撤消日志条目2），因此同一事务中应该有其他语句，但不是显示。

事务1正在等待IX锁，这将防止事务2持有X锁；事务2正在等待事务1持有的IX锁。

可以通过从表中选择*来获取IX以进行更新。 OP添加的select语句是一个简单的选择，不需要锁定。

由于您的隔离级别是REPEATABLE_READ（这是MySQL的默认设置），因此在交易期间将保留在交易期间获取的每个锁，因此您需要分析从交易开始到插入语句的查询，以查看可能获得的锁。

mysql保持并等待相同的锁

1 个答案: