mysql死锁排查

死锁

  • show engine innodb status;显示引擎参数,查死锁sql
  • show engine innodb mutex;
LATEST DETECTED DEADLOCK
------------------------
2017-01-21 23:00:32 2b4ad8705700
*** (1) TRANSACTION:
TRANSACTION 74247262250, ACTIVE 0 sec starting index read
mysql tables in use 2, locked 2
LOCK WAIT 8 lock struct(s), heap size 1184, 7 row lock(s)
MySQL thread id 4808396, OS thread handle 0x2b4a72923700, query id 77966678624 10.150.135.191 cbu_cms Sending data
update   pool_offer t1, pool_offer_batch t2 set t1.score=t2.score where   t1.pool_id=t2.pool_id and t1.offer_id=t2.offer_id and   t2.batch_id='ichoose-221556405-1484989224443'
*** (1) HOLDS THE LOCK(S):
RECORD LOCKS space id 566 page no 107635 n bits 464 index `ind_pidoid` of table `cbu_cms`.`pool_offer` trx id 74247262250 lock_mode X locks rec but not gap
Record lock, heap no 220 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
 0: len 8; hex 0000000000004acf; asc       J ;;
 1: len 8; hex 0000000039f5e41c; asc     9   ;;
 2: len 8; hex 0000000003f74e7c; asc       N|;;

*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 566 page no 107635 n bits 464 index `ind_pidoid` of table `cbu_cms`.`pool_offer` trx id 74247262250 lock_mode X locks rec but not gap waiting
Record lock, heap no 337 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
 0: len 8; hex 0000000000004acf; asc       J ;;
 1: len 8; hex 000000003d236748; asc     =#gH;;
 2: len 8; hex 0000000003fabe1d; asc         ;;

*** (2) TRANSACTION:
TRANSACTION 74247262209, ACTIVE 0 sec inserting, thread declared inside InnoDB 4685
mysql tables in use 2, locked 1
45 lock struct(s), heap size 6544, 159 row lock(s), undo log entries 80
MySQL thread id 4808449, OS thread handle 0x2b4ad8705700, query id 77966678347 11.136.33.169 cbu_cms Creating sort index
insert into pool_offer   (enter_way,gmt_create,gmt_modified,pool_id,offer_id,member_id,category_id,category1_id,category2_id,category3_id,bu_id,expired_time,offerstatus,sort,gmt_sort,status,ds_tag,location)   select 'dsimport' as   enter_way,gmt_create,gmt_modified,pool_id,offer_id,member_id,category_id,category1_id,category2_id,category3_id,bu_id,expired_time,offerstatus,sort,gmt_modified,'NORMAL'   as status,ds_tag,location from pool_offer_batch   where batch_id='import-offer-25767666-1484989291643' and   pool_id=19151 order by id   on duplicate key   update   gmt_modified=now(),gmt_sort=values(gmt_modified),sort=values(sort),   expired_time=values(expired_time),offerstatus=values(offerstatus),ds_tag=values(ds_tag),   location = values(location),   category_id = values(category_id),   category1_id = values(category1_id),   category2_id = values(category2_id),   category3_id = values(cate
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 566 page no 107635 n bits 464 index `ind_pidoid` of table `cbu_cms`.`pool_offer` trx id 74247262209 lock_mode X
Record lock, heap no 30 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
 0: len 8; hex 0000000000004acf; asc       J ;;
 1: len 8; hex 0000000a39f8a858; asc     9  X;;
 2: len 8; hex 0000000004086d36; asc       m6;;
 *** (2) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 566 page no 107635 n bits 464 index `ind_pidoid` of table `cbu_cms`.`pool_offer` trx id 74247262209 lock_mode X waiting
Record lock, heap no 220 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
 0: len 8; hex 0000000000004acf; asc       J ;;
 1: len 8; hex 0000000039f5e41c; asc     9   ;;
 2: len 8; hex 0000000003f74e7c; asc       N|;;

表结构

| pool_offer | CREATE TABLE `pool_offer` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '??',
  `gmt_create` datetime NOT NULL COMMENT '????',
  `gmt_modified` datetime NOT NULL COMMENT '????',
  `pool_id` bigint(20) unsigned DEFAULT NULL COMMENT '??ID',
  `offer_id` bigint(20) unsigned DEFAULT NULL COMMENT '??ID',
  `member_id` varchar(128) DEFAULT NULL COMMENT '??id',
  `status` varchar(64) DEFAULT NULL COMMENT '??',
  `del_operator` varchar(64) DEFAULT NULL COMMENT '?????',
  `creator` varchar(64) DEFAULT NULL COMMENT '?????',
  `modifier` varchar(64) DEFAULT NULL COMMENT '?????',
  `gmt_deleted` date DEFAULT NULL COMMENT '????',
  `enter_way` varchar(64) DEFAULT NULL COMMENT '??????',
  `sort` bigint(20) DEFAULT NULL COMMENT '??',
  `gmt_sort` datetime DEFAULT NULL COMMENT '????',
  `category_id` varchar(128) DEFAULT NULL COMMENT '????id',
  `category1_id` varchar(128) DEFAULT NULL COMMENT '????ID',
  `category2_id` varchar(128) DEFAULT NULL COMMENT '????ID',
  `category3_id` varchar(128) DEFAULT NULL COMMENT '????ID',
  `bu_id` varchar(128) DEFAULT NULL COMMENT 'BU ID',
  `expired_time` datetime DEFAULT NULL COMMENT '????',
  `offerstatus` varchar(30) DEFAULT 'published' COMMENT 'offer??(PUBLISHED???????offerdubbo??)',
  `cheat_flag` int(11) DEFAULT '0' COMMENT '????, 0???5????9???',
  `score` bigint(20) DEFAULT '0' COMMENT '?????????????????????*1000000??',
  `view_sort` bigint(20) DEFAULT NULL COMMENT 'offer??????',
  `conf_sort` bigint(20) DEFAULT NULL COMMENT '???????',
  `ds_tag` varchar(256) DEFAULT NULL COMMENT 'offer??????tag',
  `enroll_id` bigint(20) unsigned DEFAULT NULL COMMENT '??ID',
  `location` varchar(20000) DEFAULT NULL COMMENT '??????????????',
  `hpstatus` varchar(32) DEFAULT NULL COMMENT 'offer?????',
  PRIMARY KEY (`id`),
  UNIQUE KEY `ind_pidoid` (`pool_id`,`offer_id`),
  KEY `ind_memberid` (`member_id`),
  KEY `ind_gmtcreate` (`gmt_create`,`gmt_modified`),
  KEY `ind_gmtsort` (`gmt_sort`),
  KEY `idx_pool_offer_cat` (`pool_id`,`category_id`,`category1_id`,`category2_id`,`category3_id`,`member_id`,`offerstatus`),
  KEY `ind_offerid_status` (`offer_id`,`status`),
  KEY `ind_offer_pool_status` (`offer_id`,`pool_id`,`status`),
  KEY `ind_pidstatus` (`pool_id`,`status`,`ds_tag`(255)),
  KEY `ind_sort` (`pool_id`,`status`,`offerstatus`,`view_sort`,`score`)
) ENGINE=InnoDB AUTO_INCREMENT=67735804 DEFAULT CHARSET=utf8 COMMENT='???offer??' |

锁超时

  • 报错
    java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction
  • select * from information_schema.innodb_trx\G 找到当前运行的所有事物
  • select * from information_schema.processlist where id =xxx 在processlist里查看这个id的线程
  • kill掉占用锁的线程
  • 例子

记得以前,当出现:ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction,要解决是一件麻烦的事情;特别是当一个SQL执行完了,但未COMMIT,后面的SQL想要执行就是被锁,超时结束,DBA光从数据库无法着手找出源头是哪个SQL锁住了;有时候看看 show engine innodb status, 并结合 show full processlist 能暂时解决问题,但一直不能精确定位。

  • 在5.5中,information_schema 库中增加了三个关于锁的表(MEMORY引擎):
    • innodb_trx ## 当前运行的所有事务
    • innodb_locks ## 当前出现的锁
    • innodb_lock_waits ## 锁等待的对应关系
      看到这个就非常激动,这可是解决了一个大麻烦,先来看一下表结构:
root@127.0.0.1 : information_schema 13:28:38> desc innodb_locks;
+————-+———————+——+—–+———+——-+
| Field       | Type                | Null | Key | Default | Extra |
+————-+———————+——+—–+———+——-+
| lock_id     | varchar(81)         | NO   |     |         |       |#锁ID
| lock_trx_id | varchar(18)         | NO   |     |         |       |#拥有锁的事务ID
| lock_mode   | varchar(32)         | NO   |     |         |       |#锁模式
| lock_type   | varchar(32)         | NO   |     |         |       |#锁类型
| lock_table  | varchar(1024)       | NO   |     |         |       |#被锁的表
| lock_index  | varchar(1024)       | YES  |     | NULL    |       |#被锁的索引
| lock_space  | bigint(21) unsigned | YES  |     | NULL    |       |#被锁的表空间号
| lock_page   | bigint(21) unsigned | YES  |     | NULL    |       |#被锁的页号
| lock_rec    | bigint(21) unsigned | YES  |     | NULL    |       |#被锁的记录号
| lock_data   | varchar(8192)       | YES  |     | NULL    |       |#被锁的数据
+————-+———————+——+—–+———+——-+
10 rows in set (0.00 sec)

root@127.0.0.1 : information_schema 13:28:56> desc innodb_lock_waits;
+——————-+————-+——+—–+———+——-+
| Field             | Type        | Null | Key | Default | Extra |
+——————-+————-+——+—–+———+——-+
| requesting_trx_id | varchar(18) | NO   |     |         |       |#请求锁的事务ID
| requested_lock_id | varchar(81) | NO   |     |         |       |#请求锁的锁ID
| blocking_trx_id   | varchar(18) | NO   |     |         |       |#当前拥有锁的事务ID
| blocking_lock_id  | varchar(81) | NO   |     |         |       |#当前拥有锁的锁ID
+——————-+————-+——+—–+———+——-+
4 rows in set (0.00 sec)

root@127.0.0.1 : information_schema 13:29:05> desc innodb_trx ;
+—————————-+———————+——+—–+———————+——-+
| Field                      | Type                | Null | Key | Default             | Extra |
+—————————-+———————+——+—–+———————+——-+
| trx_id                     | varchar(18)         | NO   |     |                     |       |#事务ID
| trx_state                  | varchar(13)         | NO   |     |                     |       |#事务状态:
| trx_started                | datetime            | NO   |     | 0000-00-00 00:00:00 |       |#事务开始时间;
| trx_requested_lock_id      | varchar(81)         | YES  |     | NULL                |       |#innodb_locks.lock_id
| trx_wait_started           | datetime            | YES  |     | NULL                |       |#事务开始等待的时间
| trx_weight                 | bigint(21) unsigned | NO   |     | 0                   |       |#
| trx_mysql_thread_id        | bigint(21) unsigned | NO   |     | 0                   |       |#事务线程ID
| trx_query                  | varchar(1024)       | YES  |     | NULL                |       |#具体SQL语句
| trx_operation_state        | varchar(64)         | YES  |     | NULL                |       |#事务当前操作状态
| trx_tables_in_use          | bigint(21) unsigned | NO   |     | 0                   |       |#事务中有多少个表被使用
| trx_tables_locked          | bigint(21) unsigned | NO   |     | 0                   |       |#事务拥有多少个锁
| trx_lock_structs           | bigint(21) unsigned | NO   |     | 0                   |       |#
| trx_lock_memory_bytes      | bigint(21) unsigned | NO   |     | 0                   |       |#事务锁住的内存大小(B)
| trx_rows_locked            | bigint(21) unsigned | NO   |     | 0                   |       |#事务锁住的行数
| trx_rows_modified          | bigint(21) unsigned | NO   |     | 0                   |       |#事务更改的行数
| trx_concurrency_tickets    | bigint(21) unsigned | NO   |     | 0                   |       |#事务并发票数
| trx_isolation_level        | varchar(16)         | NO   |     |                     |       |#事务隔离级别
| trx_unique_checks          | int(1)              | NO   |     | 0                   |       |#是否唯一性检查
| trx_foreign_key_checks     | int(1)              | NO   |     | 0                   |       |#是否外键检查
| trx_last_foreign_key_error | varchar(256)        | YES  |     | NULL                |       |#最后的外键错误
| trx_adaptive_hash_latched  | int(1)              | NO   |     | 0                   |       |#
| trx_adaptive_hash_timeout  | bigint(21) unsigned | NO   |     | 0                   |       |#
+—————————-+———————+——+—–+———————+——-+
22 rows in set (0.01 sec)

下面我们来动手看看数据吧:

  • 建立测试数据:
use test;
create table tx1
(id int primary key ,
c1 varchar(20),
c2 varchar(30))
engine=innodb default charset = utf8 ;

insert into tx1 values
(1,’aaaa’,'aaaaa2′),
(2,’bbbb’,'bbbbb2′),
(3,’cccc’,'ccccc2′);

commit;
  • 产生事务
### Session1
start transaction;
update tx1 set c1=’heyf’,c2=’heyf’ where id = 3;

产生事务,在 innodb_trx 就有数据

root@127.0.0.1 : information_schema 13:38:21> select * from innodb_trx \G
*************************** 1. row ***************************
                    trx_id: 3669D82
                 trx_state: RUNNING
               trx_started: 2010-12-24 13:38:06
     trx_requested_lock_id: NULL
          trx_wait_started: NULL
                trx_weight: 3
       trx_mysql_thread_id: 2344
                 trx_query: NULL
       trx_operation_state: NULL
         trx_tables_in_use: 0
         trx_tables_locked: 0
          trx_lock_structs: 2
     trx_lock_memory_bytes: 376
           trx_rows_locked: 1
         trx_rows_modified: 1
   trx_concurrency_tickets: 0
       trx_isolation_level: REPEATABLE READ
         trx_unique_checks: 1
    trx_foreign_key_checks: 1
trx_last_foreign_key_error: NULL
 trx_adaptive_hash_latched: 0
 trx_adaptive_hash_timeout: 10000
1 row in set (0.00 sec)

### 由于没有产生锁等待,下面两个表没有数据
root@127.0.0.1 : information_schema 13:38:31> select * from innodb_lock_waits \G
Empty set (0.00 sec)

root@127.0.0.1 : information_schema 13:38:57> select * from innodb_locks \G
Empty set (0.00 sec)

产生锁等待

#### session 2
start transaction;
update tx1 set c1=’heyfffff’,c2=’heyffffff’ where id =3 ;

[email protected] : information_schema 13:39:01> select * from innodb_trx \G
*************************** 1. row ***************************
                    trx_id: 3669D83   ##第2个事务
                 trx_state: LOCK WAIT   ## 处于等待状态
               trx_started: 2010-12-24 13:40:07
     trx_requested_lock_id: 3669D83:49:3:4  ##请求的锁ID
          trx_wait_started: 2010-12-24 13:40:07
                trx_weight: 2
       trx_mysql_thread_id: 2346       ##线程 ID
                 trx_query: update tx1 set c1=’heyfffff’,c2=’heyffffff’ where id =3
       trx_operation_state: starting index read
         trx_tables_in_use: 1      ##需要用到1个表
         trx_tables_locked: 1      ##有1个表被锁
          trx_lock_structs: 2
     trx_lock_memory_bytes: 376
           trx_rows_locked: 1
         trx_rows_modified: 0
   trx_concurrency_tickets: 0
       trx_isolation_level: REPEATABLE READ
         trx_unique_checks: 1
    trx_foreign_key_checks: 1
trx_last_foreign_key_error: NULL
 trx_adaptive_hash_latched: 0
 trx_adaptive_hash_timeout: 10000
*************************** 2. row ***************************
                    trx_id: 3669D82 ##第1个事务
                 trx_state: RUNNING
               trx_started: 2010-12-24 13:38:06
     trx_requested_lock_id: NULL
          trx_wait_started: NULL
                trx_weight: 3
       trx_mysql_thread_id: 2344
                 trx_query: NULL
       trx_operation_state: NULL
         trx_tables_in_use: 0
         trx_tables_locked: 0
          trx_lock_structs: 2
     trx_lock_memory_bytes: 376
           trx_rows_locked: 1
         trx_rows_modified: 1
   trx_concurrency_tickets: 0
       trx_isolation_level: REPEATABLE READ
         trx_unique_checks: 1
    trx_foreign_key_checks: 1
trx_last_foreign_key_error: NULL
 trx_adaptive_hash_latched: 0
 trx_adaptive_hash_timeout: 10000
2 rows in set (0.00 sec)

[email protected] : information_schema 13:40:12> select * from innodb_locks \G
*************************** 1. row ***************************
    lock_id: 3669D83:49:3:4      ## 第2个事务需要的锁
lock_trx_id: 3669D83
  lock_mode: X
  lock_type: RECORD
 lock_table: `test`.`tx1`
 lock_index: `PRIMARY`
 lock_space: 49
  lock_page: 3
   lock_rec: 4
  lock_data: 3
*************************** 2. row ***************************
    lock_id: 3669D82:49:3:4     ## 第1个事务需要的锁
lock_trx_id: 3669D82
  lock_mode: X
  lock_type: RECORD
 lock_table: `test`.`tx1`
 lock_index: `PRIMARY`
 lock_space: 49
  lock_page: 3
   lock_rec: 4
  lock_data: 3
2 rows in set (0.00 sec)

[email protected] : information_schema 13:40:15> select * from innodb_lock_waits \G
*************************** 1. row ***************************
requesting_trx_id: 3669D83         ## 请求锁的事务
requested_lock_id: 3669D83:49:3:4  ## 请求锁的锁ID
  blocking_trx_id: 3669D82         ## 拥有锁的事务
 blocking_lock_id: 3669D82:49:3:4  ## 拥有锁的锁ID
1 row in set (0.00 sec)

参考:
MySQL 加锁处理分析
一个最不可思议的MySQL死锁分析

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