在MySQL中进行insert、update、delete等操作数据库表时，执行命令后一直没有返回操作成功提示，可能是由于其他操作正在操作表数据未执行完成而导致一直等待，我们可以通过查询information_schema获取锁表信息，执行SQL如下：
SELECT r.trx_id waiting_trx_id, r.trx_mysql_thread_id waiting_thread, TIMESTAMPDIFF( SECOND, r.trx_wait_started, CURRENT_TIMESTAMP ) wait_time, r.trx_query waiting_query, l.lock_table waiting_table_lock, b.trx_id blocking_trx_id, b.trx_mysql_thread_id blocking_thread, SUBSTRING( p. HOST, 1, INSTR(p. HOST, ':') - 1 ) blocking_host, SUBSTRING(p. HOST, INSTR(p. HOST, ':') + 1) blocking_port, IF (p.COMMAND = 'Sleep', p.TIME, 0) idel_in_trx, 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 INNER JOIN information_schema.INNODB_LOCKS l ON w.requested_lock_id = l.lock_id LEFT JOIN information_schema. PROCESSLIST p ON p.ID = b.trx_mysql_thread_id ORDER BY wait_time DESC;