链接： http://blog.itpub.net/28602568/viewspace-1874982/
标题： MySQL 查找锁之间依赖关系的信息和最源头锁的thread_id号及关系
作者：ｌōττéｒｙ版权所有[文章允许转载,但必须以链接方式注明源地址,否则追究法律责任.]
#mysql 锁之间的依赖关系信息sql如下【打开注释部分的sql是查找最源头锁的thread_id线程id及关系】
SELECT distinct b.trx_id blocking_trx_id,
b.trx_mysql_thread_id 源头锁thread_id,
SUBSTRING(p. HOST, 1, INSTR(p. HOST, ':') - 1) blocking_host,
SUBSTRING(p. HOST, INSTR(p. HOST, ':') + 1) blocking_port,
IF(p.COMMAND = 'Sleep', p.TIME, 0) idel_in_trx,
b.trx_query blocking_query,
r.trx_id waiting_trx_id,
r.trx_mysql_thread_id waiting_thread,
TIMESTAMPDIFF(SECOND, r.trx_wait_started, CURRENT_TIMESTAMP) wait_time,
r.trx_query waiting_query,
l.lock_table waiting_table_lock
FROM information_schema.INNODB_LOCKS l
LEFT JOIN information_schema.INNODB_LOCK_WAITS w
ON w.requested_lock_id = l.lock_id
LEFT JOIN information_schema.INNODB_TRX b
ON b.trx_id = w.blocking_trx_id
LEFT JOIN information_schema.INNODB_TRX r
ON r.trx_id = w.requesting_trx_id
LEFT JOIN information_schema. PROCESSLIST p
ON p.ID = b.trx_mysql_thread_id
/*JOIN (SELECT blocking_trx_id -- 查找最源头的trx_id
FROM information_schema.INNODB_LOCK_WAITS ilw
WHERE blocking_trx_id NOT IN
(SELECT requesting_trx_id
FROM information_schema.INNODB_LOCK_WAITS)) c
ON c.blocking_trx_id = b.trx_id */
ORDER BY wait_time DESC;
关联对象的介绍：
-- innodb_locks ## 当前出现的锁
mysql > 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
+-------------+---------------------+------+-----+---------+-------+
mysql>
-- innodb_lock_waits ## 锁等待的对应关
mysql > 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
+-------------------+-------------+------+-----+---------+-------+
mysql>
-- innodb_trx ## 当前运行的所有事务
> 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 | |#innodINNODB_TRXb_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 | |#
+----------------------------+---------------------+------+-----+---------------------+-------+
mysql>
扩展：
【源于本人笔记】 若有书写错误，表达错误，请指正...