用法
SELECT * FROM information_schema.INNODB_TRX
這個只能查詢此刻正在進行中的事務，已經完成的是查不到的
針對mysql 5.6，查看更具體的信息：
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;
針對mysql 5.5，查看更具體的信息：
SELECT a.trx_id, a.trx_state, a.trx_started, a.trx_query, b.ID, b. USER, b. HOST, b.DB, b.COMMAND, b.TIME, b.STATE, b.INFO FROM information_schema.INNODB_TRX a LEFT JOIN information_schema.PROCESSLIST b ON a.trx_mysql_thread_id = b.id WHERE b.COMMAND = 'Sleep';
查看事務等待情況：
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;
表字段定義
The INFORMATION_SCHEMA INNODB_TRX Table
(https://dev.mysql.com/doc/refman/5.7/en/innodb-trx-table.html)
用法展示
1.會話1進行事務修改，修改耗時較長，在此過程中我們在另外會話來查詢
BEGIN;
UPDATE salaries SET salary = 61118 WHERE emp_no % 7 = 0;
（耗時較長，迅速進行步驟2）
2.會話2查詢
3.會話1的事務結束后，（未提交）再到會話2查詢
（會話未結束，但已經沒有正在執行的sql語句）
4.提交會話1的事務
commit;
切換到會話2來查詢：
查看連接及對應的事務
SELECT * FROM information_schema.processlist p LEFT JOIN information_schema.INNODB_TRX t ON p.id = t.trx_mysql_thread_id
