MySQL如何查看未提交的事务SQL

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· 2023-01-07

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MySQL中经常遇到事务中的SQL正在执行或执行完成后未提交，如何找出对应的SQL？

1. 查看正在执行的SQL

查看事务中正在执行的SQL方式有多种，例如

1.1 通过processlist查看

会话1：执行1个SQL

mysql> begin;Query OK, 0 rows affected (0.00 sec)
mysql> select sleep(20),now() ,id from test1;

会话2：开启另一个会话，查看对应的SQL

mysql> select  id ,info  from information_schema.processlist where info is not null;+----+------------------------------------------------------------------------------+| id | info                                                                         |+----+------------------------------------------------------------------------------+| 36 | select sleep(20),now() ,id from test1                                        || 37 | select  id ,info  from information_schema.processlist where info is not null |+----+------------------------------------------------------------------------------+2 rows in set (0.00 sec)

可以看到正在执行的SQL，包括自己的SQL的id及内容

1.2 通过events_statements_current查看

会话1：执行1个SQL

mysql> begin;Query OK, 0 rows affected (0.00 sec)
mysql> select sleep(20),now() ,id from test1;

会话2：查看对应的SQL

mysql> select a.id,a.info, b.thread_id, c.sql_text  from information_schema.processlist  a, performance_schema.threads b, performance_schema.events_statements_current c  where  a.id=b.processlist_id  and b.thread_id = c.thread_id\G*************************** 1. row ***************************       id: 36     info: select sleep(20),now() ,id from test1thread_id: 76 sql_text: select sleep(20),now() ,id from test1*************************** 2. row ***************************       id: 37     info: select a.id,a.info, b.thread_id, c.sql_text  from information_schema.processlist  a, performance_schema.threads b, performance_schema.events_statements_current c  where  a.id=b.processlist_id  and b.thread_id = c.thread_idthread_id: 77 sql_text: select a.id,a.info, b.thread_id, c.sql_text  from information_schema.processlist  a, performance_schema.threads b, performance_schema.events_statements_current c  where  a.id=b.processlist_id  and b.thread_id = c.thread_id2 rows in set (0.01 sec)

2. 方式对比

通过processlist和通过events_statements_current区别在于，processlist中能查到的SQL是正在运行的SQL，而运行结束的SQL是看不到的。

会话1：执行1个SQL

mysql> begin;Query OK, 0 rows affected (0.00 sec)
mysql> select sleep(2),now() ,id from test1;+----------+---------------------+----+| sleep(2) | now()               | id |+----------+---------------------+----+|        0 | 2023-01-03 22:01:09 |  1 |+----------+---------------------+----+1 row in set (2.00 sec)

此时查看事务情况

mysql> select  * from information_schema.innodb_trx\G*************************** 1. row ***************************                    trx_id: 421227264232664                 trx_state: RUNNING               trx_started: 2023-01-03 22:01:09     trx_requested_lock_id: NULL          trx_wait_started: NULL                trx_weight: 0       trx_mysql_thread_id: 36                 trx_query: NULL       trx_operation_state: NULL         trx_tables_in_use: 0         trx_tables_locked: 0          trx_lock_structs: 0     trx_lock_memory_bytes: 1128           trx_rows_locked: 0         trx_rows_modified: 0   trx_concurrency_tickets: 0       trx_isolation_level: REPEATABLE READ         trx_unique_checks: 1    trx_foreign_key_checks: 1trx_last_foreign_key_error: NULL trx_adaptive_hash_latched: 0 trx_adaptive_hash_timeout: 0          trx_is_read_only: 0trx_autocommit_non_locking: 0       trx_schedule_weight: NULL1 row in set (0.00 sec)

其中trx_mysql_thread_id=36的会话正是我们会话1的线程id,但是我们看不到具体的SQL

mysql> select *  from information_schema.processlist where id=36;+----+------+-----------+--------+---------+------+-------+------+| ID | USER | HOST      | DB     | COMMAND | TIME | STATE | INFO |+----+------+-----------+--------+---------+------+-------+------+| 36 | root | localhost | testdb | Sleep   |  177 |       | NULL |+----+------+-----------+--------+---------+------+-------+------+1 row in set (0.00 sec)

但是此时通过方式2就可以查到

mysql> select a.id,a.info, b.thread_id, c.sql_text  from information_schema.processlist  a, performance_schema.threads b, performance_schema.events_statements_current c  where  a.id=b.processlist_id  and b.thread_id = c.thread_id\G*************************** 1. row ***************************       id: 36     info: NULLthread_id: 76 sql_text: select sleep(2),now() ,id from test1*************************** 2. row ***************************       id: 37     info: select a.id,a.info, b.thread_id, c.sql_text  from information_schema.processlist  a, performance_schema.threads b, performance_schema.events_statements_current c  where  a.id=b.processlist_id  and b.thread_id = c.thread_idthread_id: 77 sql_text: select a.id,a.info, b.thread_id, c.sql_text  from information_schema.processlist  a, performance_schema.threads b, performance_schema.events_statements_current c  where  a.id=b.processlist_id  and b.thread_id = c.thread_id2 rows in set (0.00 sec)

注意：此时只能查到一个事务中的多条SQL的最后一个

例如：

mysql> begin;Query OK, 0 rows affected (0.00 sec)
mysql> select sleep(2),now() ,id from test1;+----------+---------------------+----+| sleep(2) | now()               | id |+----------+---------------------+----+|        0 | 2023-01-03 22:01:09 |  1 |+----------+---------------------+----+1 row in set (2.00 sec)
mysql> select sleep(1),now() ,id from test1;+----------+---------------------+----+| sleep(1) | now()               | id |+----------+---------------------+----+|        0 | 2023-01-03 22:06:35 |  1 |+----------+---------------------+----+

会话2查看结果

mysql> select a.id,a.info, b.thread_id, c.sql_text  from information_schema.processlist  a, performance_schema.threads b, performance_schema.events_statements_current c  where  a.id=b.processlist_id  and b.thread_id = c.thread_id\G*************************** 1. row ***************************       id: 36     info: NULLthread_id: 76 sql_text: select sleep(1),now() ,id from test1*************************** 2. row ***************************       id: 37     info: select a.id,a.info, b.thread_id, c.sql_text  from information_schema.processlist  a, performance_schema.threads b, performance_schema.events_statements_current c  where  a.id=b.processlist_id  and b.thread_id = c.thread_idthread_id: 77 sql_text: select a.id,a.info, b.thread_id, c.sql_text  from information_schema.processlist  a, performance_schema.threads b, performance_schema.events_statements_current c  where  a.id=b.processlist_id  and b.thread_id = c.thread_id2 rows in set (0.00 sec)