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如何增加客戶端的mysql max_allowed_pa​​cket？

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如何增加客戶端的mysql max_allowed_pa​​cket？

我想增加max_allowed_packet使用遠端伺服器的 MySQL 用戶端的變數大小。我用谷歌搜尋過，我能找到的答案只討論了更改伺服器的變數。

我的客戶端程式是MySQL Workbench for Windows 7。

答案1

根據關於 max_allowed_pa​​cket 的 MySQL 文檔

某些程式（例如 mysql 和 mysqldump）允許您透過在命令列或選項檔案中設定 max_allowed_pa​​cket 來變更客戶端值。

在命令列上，要將其設定為 512M，只需執行 mysql 用戶端：

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)

您必須全域設定它。您無法在本地設定它。

你需要超級特權設定任何全域變數。

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