How to solve the problem of importing large-capacity SQL File data into Mysql
This article mainly introduces how to solve the problem of Mysql importing large-capacity SQL file data, which has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to know about it.
Mysql may have the following two problems when importing sql files:
1. If the sql file is too large, there will be a "MySQL server has gone away" problem
two。 If the sql file data is in Chinese, garbled www.2cto.com will appear.
Resolve the problem:
Problem 1: the MySQL server has gone away problem occurs because the default "max_allowed_packet" variable of mysql is too small.
View current configuration
Show VARIABLES like'% max_allowed_packet%'
The result displayed is:
+-+ +
| | Variable_name | Value |
+-+ +
| | max_allowed_packet | 1048576 | |
+-+ +
The current configuration is 1048576, 1024, 1024, 1024, 1m.
Modify the max_allowed_ packet value:
Method 1: SET GLOBAL max_allowed_packet = 500,1024,1024; (invalid by test)
Method 2: directly modify the configuration file and restart mysql www.2cto.com
Modify the my.ini file in the, and modify the my.cnf file in linux.
C:\ Documents and Settings\ All Users\ Application Data\ MySQL\ MySQL Server 5.5\ my.ini (specified data file directory at installation time)
After restarting mysql, check the modified max_allowed_ packet value
Question 2: specify character set encoding when logging in
Mysql-uroot-P3308-p123456-- default-character-set=utf8 (- P means the specified port number)
Finally, you can successfully import through the source command:
Source E:ydj\ test.sql
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