Due to work needs, I need to import a sql of about200Mto the user library
Execute the command
mysql> use user Database changed mysql> source /tmp/user.sql
appears during the import processMySQL server has gone awayError, data import failed.
The error message is as follows:
ERROR 2006 (HY000): MySQL server has gone awayERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 11Current database: userERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 12Current database: userERROR 2006 (HY000): MySQL server has gone awayERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 13Current database: user
At first I thought it was caused by a timeout, so I increased the values ofconnect_timeoutandwait_timeout.
The problem remains after re-executing.
Solution:
Check the information and found themax_allowed_packetparameter,
The official explanation is to increase it appropriatelyThe max_allowed_packetparameter allows the system to allocate more extended memory for processing when transferring large data from the client to the server.
Check the value of mysql max_allowed_packet
mysql> show global variables like 'max_allowed_packet'; +--------------------+---------+| Variable_name | Value | +--------------------+---------+| max_allowed_packet | 4194304 | +--------------------+---------+
You can see that it is4M, and then increase it to256M(1024*1024*256)
mysql> set global max_allowed_packet=268435456; Query OK, 0 rows affected (0.00 sec)mysql> show global variables like 'max_allowed_packet'; +--------------------+-----------+| Variable_name | Value | +--------------------+-----------+| max_allowed_packet | 268435456 | +--------------------+-----------+1 row in set (0.00 sec)
After modification, execute the import, everything is normal, and the problem is solved.
Note:
Use the set global command to modify the value of max_allowed_packet. It will become invalid after restarting mysql and will be restored to the default value.
If you want to not restore after restarting, you can open themy.cnffile and addmax_allowed_packet = 256M.
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