网友遇到这个问题：
对于performance_schema库show events时报 1044

mysql> use performance_schema;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show events;
ERROR 1044 (42000): Access denied for user 'root'@'localhost' to database 'performance_schema'

mysql> show grants for 'root'@'localhost';
+---------------------------------------------------------------------+
| Grants for root@localhost |
+---------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION |
| GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION |
+---------------------------------------------------------------------+
2 rows in set (0.00 sec)

mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show events;
Empty set (0.00 sec)

这个问题有点怪
原来是：
https://bugs.mysql.com/bug.php?id=32775
Bug #32775 problems with SHOW EVENTS and Information_Schema

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