今天一个同事反馈往一个MySQL数据库导入数据时，报“ERROR 1 (HY000): Can't create/write to file '/tmp/MLjnvU95' (Errcode: 13 - Permission denied)”这样的错误，如下所示：
uery OK, 0 rows affected (0.03 sec)
ERROR 1 (HY000): Can't create/write to file '/tmp/MLjnvU95' (Errcode: 13 - Permission denied)
ERROR 1 (HY000): Can't create/write to file '/tmp/MLPzmIbJ' (Errcode: 13 - Permission denied)
ERROR 1 (HY000): Can't create/write to file '/tmp/MLdpJwKm' (Errcode: 13 - Permission denied)
ERROR 1 (HY000): Can't create/write to file '/tmp/MLB7FTT0' (Errcode: 13 - Permission denied)
ERROR 1 (HY000): Can't create/write to file '/tmp/ML1wcUAF' (Errcode: 13 - Permission denied)
ERROR 1 (HY000): Can't create/write to file '/tmp/MLYjOzPk' (Errcode: 13 - Permission denied)
ERROR 1 (HY000): Can't create/write to file '/tmp/ML7gi9z0' (Errcode: 13 - Permission denied)
ERROR 1 (HY000): Can't create/write to file '/tmp/ML6nezQG' (Errcode: 13 - Permission denied)
个人使用source script.sql导入数据时，也是遇到这个错误，如上截图所示。从这个错误提示，可以明显看出是MySQL没有权限对/tmp进行操作，
查看系统变量tmpdir,如下所示，tmpdir变量指定路径为/tmp
mysql> show variables like 'tmpdir';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| tmpdir | /tmp |
+---------------+-------+
1 row in set (0.00 sec)
[root@mylx01 ~]# ls -lh /tmp
total 20M
-rw-rw-r--. 1 root root 20M Nov 7 12:04 cccc_user.sql
-rw-r--r--. 1 root root 57 Nov 7 02:00 percona-version-check
-rw-------. 1 root root 2.0K Nov 2 21:38 tmpP4BN3H
-rw-------. 1 root root 2.0K Oct 31 21:40 tmpusdOhs
-rw-------. 1 root root 2.0K Oct 30 21:36 tmp_WBZNO
-rw-------. 1 root root 2.1K Oct 29 21:38 tmpXcXptG
-rw-------. 1 root root 2.0K Nov 5 21:40 tmpyqSR0U
-rw-------. 1 root root 2.1K Oct 28 21:42 tmpZjNjtu