如何检查和设置max_allowed_packet mysql变量 [英] how to check and set max_allowed_packet mysql variable
问题描述
Possible Duplicate:
MySQL Error 1153 - Got a packet bigger than ‘max_allowed_packet’ bytes
我收到了错误消息:
[1153] Got a packet bigger than 'max_allowed_packet'bytes
但是我没有对源代码进行任何更改，托管表明他们对服务器设置没有进行任何更改.
but I made no changes in my source code and the hosting states that they did not made any change in server settings.
我不知道发生了什么.但是我正在寻找原因.
I don't know what happened. But I am trying to find the reason.
那么，如何通过php脚本检查max_allowed_packet mysql变量?
so, how to check max_allowed_packet mysql variable by php script?
并且可以在源代码中进行设置吗?
and is that possible to set it in source code?
推荐答案
max_allowed_packet
是在mysql配置中设置的，而不是在php端设置的
max_allowed_packet
is set in mysql config, not on php side
[mysqld]
max_allowed_packet=16M
您可以在mysql中看到它的当前值，如下所示:
You can see it's curent value in mysql like this:
SHOW VARIABLES LIKE 'max_allowed_packet';
您可以尝试像这样更改它，但是不太可能在共享主机上起作用:
You can try to change it like this, but it's unlikely this will work on shared hosting:
SET GLOBAL max_allowed_packet=16777216;
您可以在此处 http://上进行阅读. dev.mysql.com/doc/refman/5.1/en/packet-too-large.html
编辑
至少从mysql 5.5版本开始，[mysqld]是使max_allowed_packet正常运行所必需的.
The [mysqld] is necessary to make the max_allowed_packet working since at least mysql version 5.5.
最近在AWS EC2上使用Drupal和Solr搜索引擎设置了一个实例，该实例需要32M max_allowed_packet.您在/etc/my.cnf中的[mysqld_safe](这是mysql安装随附的默认设置)模式下设置值，则没有任何效果.我没有深入探讨这个问题.但是在将其更改为[mysqld]并重新启动mysqld之后，它就可以了.
Recently setup an instance on AWS EC2 with Drupal and Solr Search Engine, which required 32M max_allowed_packet. It you set the value under [mysqld_safe] (which is default settings came with the mysql installation) mode in /etc/my.cnf, it did no work. I did not dig into the problem. But after I change it to [mysqld] and restarted the mysqld, it worked.
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