当我尝试在我的网站上进行查询时出现错误“查询数据包太大”

Question

我再次需要你的帮助。 我正在尝试将我的 java 网站放到网上。

我用什么：

• MySQL 服务器：命令行 mysql -V，结果：mysql Ver 15.1 Distrib 10.1.23-MariaDB，使用 readline 5.2 的 debian-linux-gnu (x86_64)
• 卡宴
• Debian 服务器
• Java (Vaadin)

查询数据包过大 (4739923 > 1048576)。你可以改变这个 通过设置 max_allowed_pa​​cket' 变量在服务器上获取值。

我尝试了什么：

1. 就像错误所说的那样，我尝试通过以下方式更改服务器上的值：

• 登录我的服务器
• 连接到 MySQL：mysql -u root
• 输入：SET GLOBAL max_allowed_packet=1073741824;
• 然后，使用以下命令重新启动服务器：/etc/init.d/mysql restart

但我仍然有错误。

2.我看了看：How to change max_allowed_packet size

但是，当我执行nano /etc/mysql/my.cnf 时，文件看起来像（我没有任何 [mysql]）：

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Fri Nov 10 23:57:02 2017 from 82.236.220.195
root@XXXX:~# nano /etc/mysql/my.cnf
  GNU nano 2.7.4               File: /etc/mysql/my.cnf                Modified

# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.

#
# This group is read both both by the client and the server
# use it for options that affect everything
#
[client-server]
# The MariaDB configuration file
#
# The MariaDB/MySQL tools read configuration files in the following order:
# 1. "/etc/mysql/mariadb.cnf" (this file) to set global defaults,
# 2. "/etc/mysql/conf.d/*.cnf" to set global options.
# 3. "/etc/mysql/mariadb.conf.d/*.cnf" to set MariaDB-only options.
# 4. "~/.my.cnf" to set user-specific options.
#
# If the same option is defined multiple times, the last one will apply.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.

#
# This group is read both both by the client and the server
# use it for options that affect everything
#
[client-server]

# Import all .cnf files from configuration directory
!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mariadb.conf.d/

在mysql中，'mysql'文件夹中的文件夹/文件是：

任何提示将不胜感激！ 谢谢

编辑：在/etc/mysql/mariadb.conf.d/50-server.cnf，我改变了：

1. max_allowed_packet = 1073741824
2. max_connections = 100000

我补充说：net_buffer_length = 1048576

关于信息： 在我的工作台中，我可以看到服务器变量：

EDIT2：现在，当我在服务器上的命令行中选择变量时，我有：

MariaDB [(none)]> SELECT @@global.max_allowed_packet;
+-----------------------------+
| @@global.max_allowed_packet |
+-----------------------------+
|                  1073741824 |
+-----------------------------+
1 row in set (0.00 sec)

---

解决方案因为错误不明确。

感谢com.mysql.jdbc.PacketTooBigException

我的卡宴配置是：

<url value="jdbc:mysql://IPADDRESS:22/DBBASENAME" />
<login userName="ServerUserName" password="ServerPassword" />

但应该是：

<url value="jdbc:mysql://IPADDRESS/DBBASENAME" />
<login userName="MYSQLUserName" password="MYSQLPassword" />

Answer 1

改成my.cnf，然后重启mysqld。

更好的是，将其放在/etc/mysql/mariadb.conf.d/ 下的文件中，并指定部分：

[mysqld]
max_allowed_packet = 1073741824

当您重新启动时，您所做的 (SET) 消失了。尽管如此，它只适用于在执行SET之后登录的连接。