欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  数据库

#2006-MySQLserverhasgoneaway_MySQL

程序员文章站 2024-02-02 14:51:22
...

#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_packe
net_buffer_length = 8K

read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M