mysql权限重置

关闭mysql:
# service mysqld stop
然后:
# mysqld_safe --skip-grant-tables
启动mysql:
# service mysqld start
mysql -u root
mysql> use mysql
mysql> UPDATE user SET Password=PASSWORD('xxx') WHERE user='root';
mysql> flush privileges;
mysql>\q

修改表名：ALTER  TABLE table_name RENAME TO new_table_name