information_schema.innodb_lock_waits
information_schema.innodb_trx
information_schema.PROCESSLIST

PERFORMANCE_SCHEMA.threads
PERFORMANCE_SCHEMA.events_statements_current 

select version()

select now()

show processlist;  
显示正在运行的线程  只列出前100条

show full processlist;

show open tables;

show open tables from database;

show open tables from database;

show status like ‘%lock%'

show engine innodb status;

show variables like ‘%timeout%';
查看配置参数





查看事务等待情况

SELECT
r.trx_id waiting_trx_id,
r.trx_mysql_thread_id waiting_thread,
r.trx_query waiting_query,
b.trx_id blocking_trx_id,
b.trx_mysql_thread_id blocking_thread,
b.trx_query blocking_query
FROM information_schema.innodb_lock_waits w
INNER JOIN information_schema.innodb_trx b ON b.trx_id = w.blocking_trx_id
INNER JOIN information_schema.innodb_trx r ON r.trx_id = w.requesting_trx_id;


查看更具体的事务等待情况

SELECT
b.trx_state,
e.state,
e.time,
d.state AS block_state,
d.time AS block_time,
a.requesting_trx_id,
a.requested_lock_id,
b.trx_query,
b.trx_mysql_thread_id,
a.blocking_trx_id,
a.blocking_lock_id,
c.trx_query AS block_trx_query,
c.trx_mysql_thread_id AS block_trx_mysql_tread_id
FROM
information_schema.INNODB_LOCK_WAITS a
LEFT JOIN information_schema.INNODB_TRX b ON a.requesting_trx_id = b.trx_id
LEFT JOIN information_schema.INNODB_TRX c ON a.blocking_trx_id = c.trx_id
LEFT JOIN information_schema.PROCESSLIST d ON c.trx_mysql_thread_id = d.id
LEFT JOIN information_schema.PROCESSLIST e ON b.trx_mysql_thread_id = e.id
ORDER BY a.requesting_trx_id;


查看未关闭的事务

SELECT
a.trx_id,
a.trx_state,
a.trx_started,
a.trx_query,
b.ID,
b.USER,
b.DB,
b.COMMAND,
b.TIME,
b.STATE,
b.INFO,
c.PROCESSLIST_USER,
c.PROCESSLIST_HOST,
c.PROCESSLIST_DB,
d.SQL_TEXT

FROM

information_schema.INNODB_TRX a
LEFT JOIN information_schema.PROCESSLIST b ON a.trx_mysql_thread_id = b.id
AND b.COMMAND = 'Sleep'
LEFT JOIN PERFORMANCE_SCHEMA.threads c ON b.id = c.PROCESSLIST_ID
LEFT JOIN PERFORMANCE_SCHEMA.events_statements_current d ON d.THREAD_ID = c.THREAD_ID;




 mysql show processlist State 含义