https://blog.gongquiz.com/2022/07/26/%ec%ba%90%ec%8b%9c%eb%a9%94%eb%aa%a8%eb%a6%accache-memory%ec%9d%98-%ec%84%a4%eb%aa%85%ec%9c%bc%eb%a1%9c-%ec%98%b3%ec%9d%80-%ea%b2%83%ec%9d%80-%ec%a0%95%eb%b3%b4%ec%b2%98%eb%a6%ac%ea%b8%b0/