今天备份mysql数据时，碰到
Error 2013的错误，一起来看一下是什么原因吧！
案发现场
-bash-4.1$ mysqldump -uroot -p1234456 tpcms > ~/mysql-backup/tpcms.sql
mysqldump: [Warning] Using a password on the command line interface can be insecure.
mysqldump: Error 2013: Lost connection to MySQL server during query when dumping table `cms_basic` at row: 237
原因分析
dump的数据量太大，超过了设置的timeout时间
下面执行查询可以看到，net_read_timeout为30秒，net_write_timeout为90秒
mysql> show global variables like '%timeout%';
+-----------------------------+----------+
| Variable_name | Value |
+-----------------------------+----------+
| connect_timeout | 10 |
| delayed_insert_timeout | 300 |
| have_statement_timeout | YES |
| innodb_flush_log_at_timeout | 1 |
| innodb_lock_wait_timeout | 50 |
| innodb_rollback_on_timeout | OFF |
| interactive_timeout | 28800 |
| lock_wait_timeout | 31536000 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| rpl_stop_slave_timeout | 31536000 |
| slave_net_timeout | 60 |
| wait_timeout | 28800 |
+-----------------------------+----------+
13 rows in set (0.01 sec)
解决方案
将timeout的值调大以后,就可以正常dump了
mysql> set global net_read_timeout = 120;
Query OK, 0 rows affected (0.00 sec)
mysql> set global net_write_timeout = 900;
Query OK, 0 rows affected (0.00 sec)
mysql> show global variables like '%timeout%';
+-----------------------------+----------+
| Variable_name | Value |
+-----------------------------+----------+
| connect_timeout | 10 |
| delayed_insert_timeout | 300 |
| have_statement_timeout | YES |
| innodb_flush_log_at_timeout | 1 |
| innodb_lock_wait_timeout | 50 |
| innodb_rollback_on_timeout | OFF |
| interactive_timeout | 28800 |
| lock_wait_timeout | 31536000 |
| net_read_timeout | 120 |
| net_write_timeout | 900 |
| rpl_stop_slave_timeout | 31536000 |
| slave_net_timeout | 60 |
| wait_timeout | 28800 |
+-----------------------------+----------+
13 rows in set (0.01 sec)
