MySQL 8 记录死锁关的几张表有所变化，重新写一个脚本，便于在出现问题的时候快速处置问题。

死锁示意图

死锁相关的表

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information_schema.INNODB_TRX
`performance_schema`.data_lock_waits
`performance_schema`.threads
`performance_schema`.data_locks    -- 可不使用

相关说明

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-- request 被阻塞的
-- block 引起阻塞的
 
等效字段
`performance_schema`.threads.PROCESSLIST_ID = `information_schema`.innodb_trx.trx_mysql_thread_id = information_schema.`PROCESSLIST`.id 
`performance_schema`.threads.thread_id = `performance_schema`.data_lock_waits.REQUESTING_THREAD_ID

检测脚本

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SELECT a.*,c.trx_state as block_trx_state,c.trx_started as block_trx_started,c.trx_query as block_trx_query,c.trx_mysql_thread_id as  block_trx_mysql_thread_id,d.thread_id as block_thread_id,d.PROCESSLIST_USER as block_user,d.PROCESSLIST_HOST as block_host
from 
(SELECT b.trx_id as req_trx_id,b.trx_state as req_trx_state,b.trx_started as req_trx_started,b.trx_query as req_trx_query,b.trx_mysql_thread_id as req_trx_mysql_thread_id,c.thread_id as req_thread_id,c.PROCESSLIST_USER as req_user,c.PROCESSLIST_HOST as req_host
	from `performance_schema`.data_lock_waits a 
	INNER JOIN information_schema.INNODB_TRX b 
		on a.REQUESTING_ENGINE_TRANSACTION_ID=b.trx_id and a.REQUESTING_ENGINE_LOCK_ID = b.trx_requested_lock_id
	INNER JOIN `performance_schema`.threads c 
		on a.REQUESTING_THREAD_ID = c.THREAD_ID
) a INNER JOIN  `performance_schema`.data_lock_waits b 
			on a.req_trx_id = b.REQUESTING_ENGINE_TRANSACTION_ID and a.req_thread_id = b.REQUESTING_THREAD_ID		
		INNER JOIN information_schema.INNODB_TRX c 
			on b.BLOCKING_ENGINE_TRANSACTION_ID = c.TRX_ID
		INNER JOIN `performance_schema`.threads d
		on b.BLOCKING_THREAD_ID = d.THREAD_ID

检测结果示意