when i use admin user in rds mysql but i cannot see the global variables

yes, my production RDS instance have individual parameter group , performance_schema parameter is 0 and source column is system .

Does it have the same parameters as the development instance?

yes, both of them have same parameter . i just use different parameter group name to distinguish development and production instance. production instance has enable performance insight . and i use this document to setting https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PerfInsights.EnableMySQL.html . but my production instance still can't see global variables , when i use this command show global status like 'Thread%';

1. when i change performance_schema setting on parameter group , i have reboot the db instance . after reboot the db instance,i use show global variables command , it still not work output empty.

mysql> show global variables; Empty set (0.01 sec)

2. i have tried show local variables and show variables command . both of them output is empty.

mysql> show local variables; Empty set (0.00 sec)

mysql> show variables; Empty set (0.00 sec)