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针对云数据库，在数据库管理->具体数据库->扩展页面，手动开启和关闭扩展；
针对应用开发，在我的应用->具体应用->数据库->扩展页面，手动开启和关闭扩展； 针对应用开发，也可以使用SQL命令来添加扩展；
