如果应用程序频繁地访问没有适当索引的小表，数据库每次都会把它们装载进内存并扫描它们。
If your application frequently accesses smaller tables without proper indexes, the database will load them into memory each time and scan them.
简介：本文论述了数据进入您的程序的各种途径，重点是如何适当地对它们进行处理；您甚至可能还没有了解它们全部！
Summary: This article discusses various ways data gets into your program, emphasizing how to deal appropriately with them; you might not even know about them all!
每当用户心里想着知识库中没有的项玩这个游戏时，应用程序会在数据库中添加该项以及适当的问题和答案。
Each time a user plays and thinks of an item not in the knowledge base, the application adds that item and the appropriate question and answers to the database.
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