[MySQL] Reduce max-connections, disallow performance_schema

data/conf/mysql/my.cnf

@@ -6,8 +6,9 @@ collation-server               = utf8mb4_unicode_ci
 #innodb_file_format             = barracuda
 #innodb_large_prefix            = TRUE
 #sql_mode=IGNORE_SPACE,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
-max_allowed_packet=192M
-max-connections=1500
+max_allowed_packet      = 192M
+max-connections         = 100
+performance_schema      = 0
 innodb-strict-mode=0
 skip-host-cache
 skip-name-resolve