MySQL导出的SQL语句在导入时有可能会非常非常慢,在导出时合理使用几个参数,可以大大加快导入的速度。
MySQL导出的SQL语句在导入时有可能会非常非常慢,在导出时合理使用几个参数,可以大大加快导入的速度。
-e 使用包括几个VALUES列表的多行INSERT语法;
–max_allowed_packet=XXX 客户端/服务器之间通信的缓存区的最大大小;
–net_buffer_length=XXX TCP/IP和套接字通信缓冲区大小,创建长度达net_buffer_length的行。
注意:max_allowed_packet 和 net_buffer_length 不能比目标数据库的设定数值 大,否则可能出错。
首先确定目标数据库的参数值
mysql> show variables like ‘max_allowed_packet’;
mysql> show variables like ‘net_buffer_length’;
根据参数值书写 mysqldump 命令,如:
# mysqldump -uroot -p dbname-e --max_allowed_packet=16777216 --net_buffer_length=16384 > db_name.sql
OK,,现在速度就很快了,注意的是导入和导出端的 max_allowed_packet 和 net_buffer_length 这2个参数值设定,弄大点就可以了

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