mysql> show variables like '%secure%';

+--------------------------+-----------------------+

| Variable_name            | Value                 |

+--------------------------+-----------------------+

| require_secure_transport | OFF                   |

| secure_auth              | ON                    |

| secure_file_priv         | /var/lib/mysql-files/ |

+--------------------------+-----------------------+

3 rows in set (0.27 sec)

mysql> select * from test into outfile '/var/lib/mysql-files/test_out.txt' fields terminated by ',' optionally enclo

sed by '"';

Query OK, 5 rows affected (0.21 sec)

secure_file_priv参数说明：

这个参数用来限制数据导入和导出操作的效果，例如执行LOAD DATA、SELECT ... INTO OUTFILE语句和LOAD_FILE()函数。这些操作需要用户具有FILE权限。

1. 如果这个参数为空，这个变量没有效果；

2. 如果这个参数设为一个目录名，MySQL服务只允许在这个目录中执行文件的导入和导出操作。这个目录必须存在，MyS

QL服务不会创建它；

3. 如果这个参数为NULL，MySQL服务会禁止导入和导出操作。这个参数在MySQL 5.7.6版本引入

secure_file_priv may be set as follows:

If empty, the variable has no effect. This is not a secure setting.

If set to the name of a directory, the server limits import and export operations to work only with files in that dire

ctory. The directory must exist; the server will not create it.

If set to NULL, the server disables import and export operations.