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如何增加客户端的 mysql max_allowed_pa​​cket？

tag-icon • tag-icon windows-7 mysql mysql-workbench
如何增加客户端的 mysql max_allowed_pa​​cket？

我想增加max_allowed_packet使用远程服务器的 MySQL 客户端的变量大小。我在 Google 上搜索过，找到的答案只讨论了更改服务器的变量。

我的客户端程序是适用于 Windows 7 的 MySQL Workbench。

答案1

根据MySQL 文档中的 max_allowed_pa​​cket

一些程序（例如 mysql 和 mysqldump）允许您通过在命令行或选项文件中设置 max_allowed_pa​​cket 来更改客户端值。

在命令行上，要将其设置为 512M，只需使用以下命令运行 mysql 客户端：

C:\>mysql -u... -p...

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 31
Server version: 5.5.12-log MySQL Community Server (GPL)

Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show variables like 'max_allowed_packet';
+--------------------+----------+
| Variable_name      | Value    |
+--------------------+----------+
| max_allowed_packet | 16777216 |
+--------------------+----------+
1 row in set (0.00 sec)

mysql> set max_allowed_packet=1024 * 1024 * 512;
ERROR 1621 (HY000): SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
mysql> set global max_allowed_packet=1024 * 1024 * 512;
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like 'max_allowed_packet';
+--------------------+----------+
| Variable_name      | Value    |
+--------------------+----------+
| max_allowed_packet | 16777216 |
+--------------------+----------+
1 row in set (0.00 sec)

mysql> exit
Bye

C:\>mysql -u... -p...
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 32
Server version: 5.5.12-log MySQL Community Server (GPL)

Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show variables like 'max_allowed_packet';
+--------------------+-----------+
| Variable_name      | Value     |
+--------------------+-----------+
| max_allowed_packet | 536870912 |
+--------------------+-----------+
1 row in set (0.00 sec)

您必须全局设置它。您无法在本地设置它。

你需要超级特权设置任何全局变量。

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