Error handling when MySQL 5.1 is upgraded

Mysql in the production environment is upgraded from 5.0 to 5.1 today. An error is returned in the result log, as shown below:
Event schedaliz: An error occurred when initializing system tables. Disabling the Event Scheduler.
Mysql. user has no 'event _ priv' column at position 29
 
Solution:
Fix mysql system tables
Mysql_fix_privilege_tables
Or provide password repair
Mysql_fix_privilege_tables -- password = root_password
The mysql_fix_privilege_tables script can convert the system table to the current format. You may see some Duplicate column name warnings at runtime; you can ignore them.

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