MySQL 备份遇到的问题

[root@localhost mc_orderdb]# mysqldump -ubackup -p --master-data=2 --single-transaction --routines --triggers --events  --tab="/tmp/mc_orderdb"  mc_orderdb
Enter password: 

--
-- Position to start replication or point-in-time recovery from
--

-- CHANGE MASTER TO MASTER_LOG_FILE='mysql_bin.000009', MASTER_LOG_POS=1095;
mysqldump: Got error: 1: Can't create/write to file '/tmp/mc_orderdb/order_cart.txt' (Errcode: 13 - Permission denied) when executing 'SELECT INTO OUTFILE'

目前已知是权限问题
[root@localhost tmp]# chown mysql:mysql mc_orderdb/

[root@localhost tmp]# ll
drwxr-xr-t. 2 mysql mysql    28 7月  31 21:07 mc_orderdb

再次执行mysqldump -ubackup -p --master-data=2 --single-transaction --routines --triggers --events --tab="/tmp/mc_orderdb" mc_orderdb
还是报错：

[root@localhost mc_orderdb]# mysqldump -ubackup -p --master-data=2 --single-transaction --routines --triggers --events  --tab="/tmp/mc_orderdb"  mc_orderdb
Enter password: 

--
-- Position to start replication or point-in-time recovery from
--

-- CHANGE MASTER TO MASTER_LOG_FILE='mysql_bin.000009', MASTER_LOG_POS=1095;
mysqldump: Got error: 1: Can't create/write to file '/tmp/mc_orderdb/order_cart.txt' (Errcode: 13 - Permission denied) when executing 'SELECT INTO OUTFILE'