How to change max_allowed_packet value in mysql?
If you set it in the cnf(it may be my.ini file) you will likely need to restart the server. Optionally, that is a dynamic variable and can be SET GLOBAL or SET SESSION from the command line as well.So just do as follows.
mysql>show variables like’max_allowed_packet’;
mysql>set global max_allowed_packet=67108864;
mysql>exit;
Note: If you don't use global or use session,after execute exit command,max_allowed_packet value will be still 1048576.
相关文档：
在腾科培训了有1个半月了，终于学完JSP+SERVLET+JAVABEAN+MYSQL，学了java的第一套web解决方案。老师要求我们6人一组开始做一个订餐系统。这个系统没有什么特别的，就跟电子商城是一个样的。由于要对数据库做大量的增删改查，那个代码又多，我想能不能将数据库操作的这一层打包起来(SqlOperDao)，让我对数据库操作，用几行� ......
Starting the cluster is not very difficult after it has been configured. Each cluster node process must be started separately, and on the host where it resides. The management node should be started first, followed by the data nodes, and then finally by any SQL nodes:
On the management host, issu ......
To shut down the cluster, enter the following command in a shell
on the machine hosting the management node:
shell> ndb_mgm -e shutdown
The -e
option here is used to pass a command to
the ndb_mgm
client from the shell. (See
Section 4.23, “ ......
GROUP_CONCAT 是一个合并多行的函数，一般用的少，所以很多人都不知道，我也是一个，今天偶然看到，故记下方法；
GROUP_CONCAT的语法如下：
GROUP_CONCAT([DISTINCT] expr [,expr ...][ORDER BY {unsigned_integer | col_name | expr}[ASC | DESC] [,col_name ...]][SEPARATOR str_val])
下面演示一下这个函数，先建立� ......
以下转自 Osss.cn 邮件，请使用过、正在使用或者支持开源的朋友支持一下MySql，谢谢。
也希望教育部、科技部给予直接支持！
大家好：今天看到这则新闻，与大家共享一下，MySQL创始人希望中国商务部能介入Oracle&Sun收购案，好像并没有实质进展。而俄罗斯联邦反垄断机构在上周展开调查。如果需要商务� ......
