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;QueryOK, 0rowsaffected (0.00sec)mysql>selectsleep(20),now() ,idfromtest1;
会话2：开启另一个会话，查看对应的SQL
mysql>selectid ,infofrominformation_schema.processlistwhereinfoisnotnull;+----+------------------------------------------------------------------------------+|id|info|+----+------------------------------------------------------------------------------+|36|selectsleep(20),now() ,idfromtest1||37|selectid ,infofrominformation_schema.processlistwhereinfoisnotnull|+----+------------------------------------------------------------------------------+2rowsinset (0.00sec)
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;QueryOK, 0rowsaffected (0.00sec)mysql>selectsleep(20),now() ,idfromtest1;
会话2：查看对应的SQL
mysql>selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_id\G***************************1.row***************************id: 36info: selectsleep(20),now() ,idfromtest1thread_id: 76sql_text: selectsleep(20),now() ,idfromtest1***************************2.row***************************id: 37info: selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_idthread_id: 77sql_text: selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_id2rowsinset (0.01sec)
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;QueryOK, 0rowsaffected (0.00sec)mysql>selectsleep(2),now() ,idfromtest1;+----------+---------------------+----+|sleep(2) |now() |id|+----------+---------------------+----+|0|2023-01-0322:01:09|1|+----------+---------------------+----+1rowinset (2.00sec)
此时查看事务情况
mysql>select*frominformation_schema.innodb_trx\G***************************1.row***************************trx_id: 421227264232664trx_state: RUNNINGtrx_started: 2023-01-0322:01:09trx_requested_lock_id: NULLtrx_wait_started: NULLtrx_weight: 0trx_mysql_thread_id: 36trx_query: NULLtrx_operation_state: NULLtrx_tables_in_use: 0trx_tables_locked: 0trx_lock_structs: 0trx_lock_memory_bytes: 1128trx_rows_locked: 0trx_rows_modified: 0trx_concurrency_tickets: 0trx_isolation_level: REPEATABLEREADtrx_unique_checks: 1trx_foreign_key_checks: 1trx_last_foreign_key_error: NULLtrx_adaptive_hash_latched: 0trx_adaptive_hash_timeout: 0trx_is_read_only: 0trx_autocommit_non_locking: 0trx_schedule_weight: NULL1rowinset (0.00sec)
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*frominformation_schema.processlistwhereid=36;+----+------+-----------+--------+---------+------+-------+------+|ID|USER|HOST|DB|COMMAND|TIME|STATE|INFO|+----+------+-----------+--------+---------+------+-------+------+|36|root|localhost|testdb|Sleep|177||NULL|+----+------+-----------+--------+---------+------+-------+------+1rowinset (0.00sec)
但是此时通过方式2就可以查到
mysql>selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_id\G***************************1.row***************************id: 36info: NULLthread_id: 76sql_text: selectsleep(2),now() ,idfromtest1***************************2.row***************************id: 37info: selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_idthread_id: 77sql_text: selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_id2rowsinset (0.00sec)
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;QueryOK, 0rowsaffected (0.00sec)mysql>selectsleep(2),now() ,idfromtest1;+----------+---------------------+----+|sleep(2) |now() |id|+----------+---------------------+----+|0|2023-01-0322:01:09|1|+----------+---------------------+----+1rowinset (2.00sec)mysql>selectsleep(1),now() ,idfromtest1;+----------+---------------------+----+|sleep(1) |now() |id|+----------+---------------------+----+|0|2023-01-0322:06:35|1|+----------+---------------------+----+
会话2查看结果
mysql>selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_id\G***************************1.row***************************id: 36info: NULLthread_id: 76sql_text: selectsleep(1),now() ,idfromtest1***************************2.row***************************id: 37info: selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_idthread_id: 77sql_text: selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_id2rowsinset (0.00sec)
可见，查到的是最后一个SQL了，如果事务手动commit提交了，则显示的是commit
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;QueryOK, 0rowsaffected (0.00sec)mysql>selectsleep(20),now() ,idfromtest1;
会话2：开启另一个会话，查看对应的SQL
mysql>selectid ,infofrominformation_schema.processlistwhereinfoisnotnull;+----+------------------------------------------------------------------------------+|id|info|+----+------------------------------------------------------------------------------+|36|selectsleep(20),now() ,idfromtest1||37|selectid ,infofrominformation_schema.processlistwhereinfoisnotnull|+----+------------------------------------------------------------------------------+2rowsinset (0.00sec)
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;QueryOK, 0rowsaffected (0.00sec)mysql>selectsleep(20),now() ,idfromtest1;
会话2：查看对应的SQL
mysql>selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_id\G***************************1.row***************************id: 36info: selectsleep(20),now() ,idfromtest1thread_id: 76sql_text: selectsleep(20),now() ,idfromtest1***************************2.row***************************id: 37info: selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_idthread_id: 77sql_text: selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_id2rowsinset (0.01sec)
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;QueryOK, 0rowsaffected (0.00sec)mysql>selectsleep(2),now() ,idfromtest1;+----------+---------------------+----+|sleep(2) |now() |id|+----------+---------------------+----+|0|2023-01-0322:01:09|1|+----------+---------------------+----+1rowinset (2.00sec)
此时查看事务情况
mysql>select*frominformation_schema.innodb_trx\G***************************1.row***************************trx_id: 421227264232664trx_state: RUNNINGtrx_started: 2023-01-0322:01:09trx_requested_lock_id: NULLtrx_wait_started: NULLtrx_weight: 0trx_mysql_thread_id: 36trx_query: NULLtrx_operation_state: NULLtrx_tables_in_use: 0trx_tables_locked: 0trx_lock_structs: 0trx_lock_memory_bytes: 1128trx_rows_locked: 0trx_rows_modified: 0trx_concurrency_tickets: 0trx_isolation_level: REPEATABLEREADtrx_unique_checks: 1trx_foreign_key_checks: 1trx_last_foreign_key_error: NULLtrx_adaptive_hash_latched: 0trx_adaptive_hash_timeout: 0trx_is_read_only: 0trx_autocommit_non_locking: 0trx_schedule_weight: NULL1rowinset (0.00sec)
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*frominformation_schema.processlistwhereid=36;+----+------+-----------+--------+---------+------+-------+------+|ID|USER|HOST|DB|COMMAND|TIME|STATE|INFO|+----+------+-----------+--------+---------+------+-------+------+|36|root|localhost|testdb|Sleep|177||NULL|+----+------+-----------+--------+---------+------+-------+------+1rowinset (0.00sec)
但是此时通过方式2就可以查到
mysql>selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_id\G***************************1.row***************************id: 36info: NULLthread_id: 76sql_text: selectsleep(2),now() ,idfromtest1***************************2.row***************************id: 37info: selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_idthread_id: 77sql_text: selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_id2rowsinset (0.00sec)
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;QueryOK, 0rowsaffected (0.00sec)mysql>selectsleep(2),now() ,idfromtest1;+----------+---------------------+----+|sleep(2) |now() |id|+----------+---------------------+----+|0|2023-01-0322:01:09|1|+----------+---------------------+----+1rowinset (2.00sec)mysql>selectsleep(1),now() ,idfromtest1;+----------+---------------------+----+|sleep(1) |now() |id|+----------+---------------------+----+|0|2023-01-0322:06:35|1|+----------+---------------------+----+
会话2查看结果
mysql>selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_id\G***************************1.row***************************id: 36info: NULLthread_id: 76sql_text: selectsleep(1),now() ,idfromtest1***************************2.row***************************id: 37info: selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_idthread_id: 77sql_text: selecta.id,a.info, b.thread_id, c.sql_textfrominformation_schema.processlista, performance_schema.threadsb, performance_schema.events_statements_currentcwherea.id=b.processlist_idandb.thread_id=c.thread_id2rowsinset (0.00sec)
可见，查到的是最后一个SQL了，如果事务手动commit提交了，则显示的是commit。