mysqldump: Got error: 1142

[root@cactitest ~]# mysqldump -uroot -p --default-character-set=utf8  --all-databases  >alldb.sql
Enter password: 
-- Warning: Skipping the data of table mysql.event. Specify the --events option explicitly.
mysqldump: Got error: 1142: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'accounts' when using LOCK TABLES

[root@cactitest ~]# 

解决办法，添加参数 --skip-lock-tables