执行简单的update语句失效:报错
jdbc PreparedStatement executeBatch
解决办法:
1、 ps -ef | grep mysql 找到mysql安装路径
2、cd mysql路径-->进入bin,执行mysql -uroot -p进入命令行
3、查看数据库的隔离级别:
mysql> select @@tx_isolation;
+-----------------+
| @@tx_isolation |
+-----------------+
| REPEATABLE-READ |
+-----------------+
1 row in set (0.00 sec)
4,去查看先当前库的线程情况:
mysql> show full processlist;
+----------+-----------------+-------------------+-----------------+-------------+---------+-------------------------+-----------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----------+-----------------+-------------------+-----------------+-------------+---------+-------------------------+-----------------------+
| 1 | event_scheduler | localhost | NULL | Daemon | 9635385 | Waiting on empty queue | NULL |
| 9930577 | business_web | 192.168.1.21:45503 | business_db | Sleep | 153 | | NULL |
| 9945825 | business_web | 192.168.1.25:49518 | business_db | Sleep | 43 | | NULL |
| 9946322 | business_web | 192.168.1.23:44721 | business_db | Sleep | 153 | | NULL |
| 9960167 | business_web | 192.168.3.28:2409 | business_db | Sleep | 93 | | NULL |
| 9964484 | business_web | 192.168.1.21:24280 | business_db | Sleep | 7 | | NULL |
| 9972499 | business_web | 192.168.3.28:35752 | business_db | Sleep | 13 | | NULL |
| 10000117 | business_web | 192.168.3.28:9149 | business_db | Sleep | 6 | | NULL |
| 10002523 | business_web | 192.168.3.29:42872 | business_db | Sleep | 6 | | NULL |
| 10007545 | business_web | 192.168.1.21:51379 | business_db | Sleep | 155 | | NULL |
没有看到正在执行的慢SQL记录线程,再去查看innodb的事务表INNODB_TRX,看下里面是否有正在锁定的事务线程,看看ID是否在show full processlist里面的sleep线程中,如果是,就证明这个sleep的线程事务一直没有commit或者rollback而是卡住了,我们需要手动kill掉。<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>*************************** 1. row ***************************</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_id: 20866</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_state: LOCK WAIT</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_started: 2014-07-31 10:42:35</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_requested_lock_id: 20866:617:3:3</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_wait_started: 2014-07-30 10:42:35</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_weight: 2</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_mysql_thread_id: <strong><span style="background-color:#FF9900;">9930577</span></strong></span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_query: delete from dltask where id=1</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_operation_state: starting index read</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_tables_in_use: 1</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_tables_locked: 1</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_lock_structs: 2</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_lock_memory_bytes: 376</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_rows_locked: 1</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_rows_modified: 0</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_concurrency_tickets: 0</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_isolation_level: READ COMMITTED</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_unique_checks: 1</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_foreign_key_checks: 1</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_last_foreign_key_error: NULL</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_adaptive_hash_latched: 0</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_adaptive_hash_timeout: 10000</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_is_read_only: 0</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>trx_autocommit_non_locking: 0</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<strong>6、看到有这条</strong><strong>9930577</strong><strong>的</strong><span><strong>sql</strong></span><strong>,</strong><span><strong>kill</strong></span><strong>掉,执行</strong><span><strong>kill 9930577;</strong></span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>mysql> kill 9930577;</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>Query OK, 0 rows affected (0.00 sec)</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>
</span></p><p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span style="color:#4C33E5;">7、然后再去查询</span><span style="color:#4C33E5;">INNODB_TRX</span><span style="color:#4C33E5;">表,就没有阻塞的事务</span><span style="color:#4C33E5;">sleep</span><span style="color:#4C33E5;">线程存在了,如下所示:</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>mysql> SELECT * FROM INNODB_TRX\G;</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>Empty set (0.00 sec)</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>ERROR:</span>
</p>
<p style="color:#333333;font-family:tahoma, 宋体;font-size:14px;text-align:justify;background-color:#FAFAFC;">
<span>No query specified</span>
</p>
8,总结分析
表数据量也不大,按照普通的情况来说,简单的update应该不会造成阻塞的,mysql都是autocommit,不会出现update卡住的情况,去查看下autocommit的值。
mysql> select @@autocommit;
+--------------+
| @@autocommit |
+--------------+
| 0 |
+--------------+
1 row in set (0.00 sec)
用pgsql
一样的问题,程序是ssh的所有事务交给了spring管理,可是报了这个错误,不知道原因,只能先kill掉。
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