ERROR 1577 (HY000): Cannot proceed because system tables used by Event Schedule

mysql> select  *from information_schema.events;
ERROR 1577 (HY000): Cannot proceed because system tables used by Event Scheduler were found damaged at server start


mysql> show variables like 'event_scheduler';
+-----------------+----------+
| Variable_name   | Value    |
+-----------------+----------+
| event_scheduler | DISABLED |
+-----------------+----------+
1 row in set (0.00 sec)
mysql> select * from mysql.event;
Empty set (0.00 sec)




log中
2015-08-28 06:56:41 1628 [ERROR] Incorrect definition of table mysql.db: expected column 'User' at position 2 to have type char(16), found type char(80).
2015-08-28 06:56:41 1628 [ERROR] Incorrect definition of table mysql.event: expected column 'definer' at position 3 to have type char(77), found type char(141).
2015-08-28 06:56:41 1628 [ERROR] Incorrect definition of table mysql.event: expected column 'sql_mode' at position 14 to have type set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','NOT_USED','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB','NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40','ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_ALL_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','INVALID_DATES','ERROR_FOR_DIVISION_BY_ZERO','TRADITIONAL','NO_AUTO_CREATE_USER','HIGH_NOT_PRECEDENCE','NO_ENGINE_SUBSTITUTION','PAD_CHAR_TO_FULL_LENGTH'), found type set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','IGNORE_BAD_TABLE_OPTIONS','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB','NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40','ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_A
2015-08-28 06:56:41 1628 [ERROR] Event Scheduler: An error occurred when initializing system tables. Disabling the Event Scheduler.
2015-08-28 06:56:41 1628 [Note] /data/program/mysql/mysql-5.6.20/bin/mysqld: ready for connections.
Version: '5.6.20'  socket: '/data/instance/mysql-5.6/mysqld.sock'  port: 3306  Source distribution


需要對錶進行修復
mysql_upgrade

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