Created
March 31, 2020 17:28
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Performance Schema: summarize row locks of oldest 100 transactions
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SELECT | |
thr.processlist_id AS mysql_thread_id, | |
FORMAT_PICO_TIME(trx.timer_wait) as trx_duration, | |
COUNT(case when lock_status='GRANTED' then 1 else null end) AS row_locks_held, | |
COUNT(case when lock_status='PENDING' then 1 else null end) AS row_locks_pending, | |
GROUP_CONCAT(DISTINCT CONCAT(object_schema, '.', object_name)) AS tables_with_locks | |
FROM | |
performance_schema.events_transactions_current trx | |
INNER JOIN performance_schema.threads thr USING (thread_id) | |
LEFT JOIN data_locks USING (thread_id) | |
GROUP BY thread_id, timer_wait | |
ORDER BY TIMER_WAIT DESC LIMIT 100; | |
.. | |
+-----------------+--------------+----------------+-------------------+-------------------+ | |
| mysql_thread_id | trx_duration | row_locks_held | row_locks_pending | tables_with_locks | | |
+-----------------+--------------+----------------+-------------------+-------------------+ | |
| 8 | 33.57 min | 3 | 0 | test.t0 | | |
| NULL | 184.07 us | 0 | 0 | NULL | | |
| NULL | 5.63 us | 0 | 0 | NULL | | |
+-----------------+--------------+----------------+-------------------+-------------------+ | |
3 rows in set (0.00 sec) | |
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