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[Mysql/MariaDB] 修改資料輸入上限max_allowed_packet @New Jinzan Blog
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[Mysql/MariaDB] 修改資料輸入上限max_allowed_packet

Mysql/MariaDB 修改資料輸入上限max_allowed_packet。

Full Link //n.sfs.tw/m10147

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(Welcome to reprint and indicate the source when reproducing.)
2016-12-05 04:36:54 By Uhoo Z

Mysql 的text或bolb欄位最大長度約是65k,如果是mediumtext/longtext就會多達16mb/4g

但是預設mysql只容許一次輸入最大的資料量是1mb,造成超過1mb的資料無法塞入。

錯誤狀況

mysql
ERROR 1153 (08S01) at line xxx: Got a packet bigger than 'max_allowed_packet' bytes

mysqldump
mysqldump: Out of memory (Needed 1477684 bytes)
mysqldump: Got error: 2008: MySQL client run out of memory when retrieving data from server

查看設定

mysql> show variables like 'max_allowed_packet';
+--------------------+----------+
| Variable_name      | Value    |
+--------------------+----------+
| max_allowed_packet | 10485760 |
+--------------------+----------+
1 row in set (0.00 sec)

修正方法

1.修改 /etc/my.cnf,在[mysqld] 欄目下設定

[mysqld]
max_allowed_packet=16M

重新啟動mysqld 即可

2. 若只是一個 mysql 客戶,沒有修改設定檔的權限怎麼處理? 你可以使用以下指令來設定更大的緩衝區,例如 8M:

$ mysql --set-variable=max_allowed_packet=8M ..+你的指令..

3. 在 mysql console 中設定,但重啟mysql會恢復原狀

mysql> set global max_allowed_packet=100000000; 

參考資料

[1] http://forums.mysql.com/read.php?35,75794,75794#msg-75794


原文 2009-11-15 07:41:57 、2010-04-26 23:12:34 合併

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