监控数据,主库有大事物运行,可通过如下命令检查下是哪些相关语句导致。
事务未提交sql
SELECT
it.trx_id AS trx_id,
it.trx_state AS trx_state,
it.trx_started AS trx_started,
it.trx_mysql_thread_id AS trx_mysql_thread_id,
CURRENT_TIMESTAMP - it.trx_started AS RUN_TIME,
pl.USER AS USER,
pl.HOST AS HOST,
pl.db AS db,
pl.time AS trx_run_time,
pl.INFO AS INFO
FROM
information_schema.INNODB_TRX it,
information_schema.PROCESSLIST pl
WHERE
pl.id = it.trx_mysql_thread_id
ORDER BY
RUN_TIME DESC
LIMIT 10;
哪个事务阻塞了另一个事务:
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 \G
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