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alter table performance_schema.users
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add column foo integer;
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ERROR 42000: Access denied for user 'root'@'localhost' to database 'performance_schema'
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truncate table performance_schema.users;
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ALTER TABLE performance_schema.users ADD INDEX test_index(CURRENT_CONNECTIONS);
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ERROR 42000: Access denied for user 'root'@'localhost' to database 'performance_schema'
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CREATE UNIQUE INDEX test_index ON performance_schema.users(CURRENT_CONNECTIONS);
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ERROR 42000: Access denied for user 'root'@'localhost' to database 'performance_schema'