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#2006 - MySQL server has gone away
#2006 - MySQL server has gone away
对于web应用来说,经常会用到mysql,而数据的备份与还原是web应用经常做的事,一般来说,用客户端工具phpmyadmin,sqlyog 等,来备份数据库没有任何问题,还原时经常碰到mysql提示的#2006错误。
Error: 2006
(CR_SERVER_GONE_ERROR
)
Message: MySQL server has gone away
原因可能是sql语句过长,超过mysql通信缓存区最大长度;
调整mysql配置文件中max_allowed_packet
mysql配置文件mysql ini(部分)
# Example MySQL config file for medium systems. # # This is for a system with little memory (32M - 64M) where MySQL plays # an important part, or systems up to 128M where MySQL is used together with # other programs (such as a web server) # # You can copy this file to # /etc/my.cnf to set global options, # mysql-data-dir/my.cnf to set server-specific options (in this # installation this directory is C:\mysql\data) or # ~/.my.cnf to set user-specific options. # # In this file, you can use all long options that a program supports. # If you want to know which options a program supports, run the program # with the "--help" option. # The following options will be passed to all MySQL clients [client] #password = your_password port = 3306 socket = /tmp/mysql.sock # Here follows entries for some specific programs # The MySQL server [wampmysqld]#mysql端口port = 3306 socket = /tmp/mysql.sock #索引缓存区,决定你索引查询时能访问速度key_buffer_size = 16M#通信缓存区最大长度,决定你sql语句中字符串最大长度max_allowed_packet = 1M#排序缓存区,决定你orderby的速度sort_buffer_size = 512K#通信缓存区大小,查询时默认该值为通信缓存区大小,若不够会自动增加直到达到max_allowed_packenet_buffer_length = 8K read_buffer_size = 256K read_rnd_buffer_size = 512K myisam_sort_buffer_size = 8M
#2006 - MySQL server has gone away
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