Error writing file '/tmp/MLLGyECY' (Errcode: 28

mysql 的一个从库报错：

Could not execute Write_rows event on table xxx.xxxx_tmp_tj; Error writing file '/tmp/MLLGyECY' (Errcode: 28 - No space left on device), Error_code: 3; Error writing file 'mysql-bin' (errno: 28 - No space left on device), Error_code: 1026; Writing one row to the row-based binary log failed, Error_code: 1534; handler error HA_ERR_RBR_LOGGING_FAILED; the event's master log mysql-bin.003482, end_log_pos 119034357
Replicate_Ignore_Server_Ids:

df -h 查看 /tmp 目录6.3G，应该是大事务导致需要很大的临时空间，导致6.3G不够用。所以报错。

修改my.cnf, 在 [mysqld] 下面加上配置项：

tmpdir = /data/tmp 

重启mysqld.

  解决问题。

 官网文档 关于 tmpdir 的说明：

The path of the directory to use for creating temporary files. It might be useful if your default /tmp directory resides on a partition 
that is too small to hold temporary tables. This option accepts several paths that are used in round-robin fashion. Paths should be 
separated by colon characters (:) on Unix and semicolon characters (;) on Windows. If the MySQL server is acting as a replication slave, 
you should not set --tmpdir to point to a directory on a memory-based file system or to a directory that is cleared when the server host 
restarts. For more information about the storage location of temporary files, see Section B.5.3.5, “Where MySQL Stores Temporary Files”. 
A replication slave needs some of its temporary files to survive a machine restart so that it can replicate temporary tables or LOAD DATA
 INFILE operations. If files in the temporary file directory are lost when the server restarts, replication fails.