mysql8 0檢視鎖資訊

sys.`innodb_lock_waits`

performance_schema.events_statements_history

performance_schema.data_locks

performance_schema.data_locks_wait

performance_schema.data_locks

performance_schema.data_locks_wait

首先檢視系統鎖情況，下面這條語句可以看到持有鎖的執行緒以及執行緒id，這裡需要注意下，session_id也就是show processlist查詢出來的鏈結id，在這個表裡表現為pid，同時該錶也記錄了trx_id，最後還給出了解決方案也就是如何kill持有鎖的程序。

mysql

>
select
*from
sys.`innodb_lock_waits` \g
***************************
1. row ***************************
wait_started: 
2019-01
-2814:27:03
wait_age: 
00:00:03
wait_age_secs: 
3locked_table: `test`.`t`
locked_table_schema: test
locked_table_name: t
locked_table_partition: 
null
locked_table_subpartition: 
null
locked_index: gen_clust_index
locked_type: record
waiting_trx_id: 
19758723
waiting_trx_started: 
2019-01
-2814:27:03
waiting_trx_age: 
00:00:03
waiting_trx_rows_locked: 
1waiting_trx_rows_modified: 
0waiting_pid: 
4202
waiting_query: 
update t set id=
8waiting_lock_id: 
19758723:4998:4:2
waiting_lock_mode: x
blocking_trx_id: 
19748728
blocking_pid: 
4200
blocking_query: 
null
blocking_lock_id: 
19748728:4998:4:2
blocking_lock_mode: x
blocking_trx_started: 
2019-01
-2810:58:27
blocking_trx_age: 
03:28:39
blocking_trx_rows_locked: 
2blocking_trx_rows_modified: 
1sql_kill_blocking_query: 
kill query 4200
sql_kill_blocking_connection: 
kill
4200
1 row in
set (0.02 sec

##等待鎖的語句

select
*from performance_schema.events_statements_history where thread_id in( 
select b.`thread_id` from sys.`innodb_lock_waits` as a , performance_schema.threads asb 
where a.waiting_pid =
b.`processlist_id`)
order
by timer_start asc;

##持有鎖的語句

select
*from performance_schema.events_statements_history where thread_id in( 
select b.`thread_id` from sys.`innodb_lock_waits` as a , performance_schema.threads asb 
where a.`blocking_pid` =
b.`processlist_id`)
order
by timer_start asc;

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