MySQLトラブルシューティング - mysqldump: Couldn't execute 'FLUSH TABLES': Access denied; you need (at least one of) the RELOAD privilege(s) for this operation (1227)

$ mysqldump --lock-all-tables --events -h <host_name> -u <user> -p<password> --no-create-info <db_name> <table, ...> > output.sql

mysqldump: Couldn't execute 'FLUSH TABLES': Access denied; you need (at least one of) the RELOAD privilege(s) for this operation (1227)

mysql> GRANT RELOAD ON *.* TO '<user>'@'<host_name>';
mysql> FLUSH PRIVILEGES;