lab1也就是写一个buffer pool, 所以说这一节特别重要, 务必要弄懂!!!
spatial control: where to write pages to disk, the goal is to keep pages that are used together often as physically close together as possible on the disk;
Temporal Control:When to read pages into memory, and when to write them to disk.The goal is minimize the number of stalls from having to read data from disk.
more >>15445这门课的第一份hwhttps://15445.courses.cs.cmu.edu/fall2020/homework1/,
主要是对这个数据库https://musicbrainz.org/doc/MusicBrainz_Database
进行一些sql语句的编写;
more >>第二课, 快速学习SQL…
用户只需要说明需要什么, 而不需要说明如何计算得到他…(中文好别扭, 还是用英文).
User only needs to specify the answer that they want, not how to compute it.
DBMS负责query的高效执行, 一些high-end系统有query优化器可以重写输入query并且查找最优的执行策略.
more >>今天正式开始写project, 希望能够坚持下去.
作业地址: https://15445.courses.cs.cmu.edu/fall2020/project0/
In this project, you will implement three classes: Matrix, RowMatrix, and RowMatrixOperations. These matrices are simple two-dimensional matrices that must support addition, matrix multiplication, and a simplified General Matrix Multiply (GEMM) operations.
狗群友都拿到amazon offer了, 我好酸啊! 而我的简历上还不知道写什么项目, 决定写一遍15445!!!
organized collection of interrelated data that models some aspect of the real world.
more >>明天面试C++实习, 简历上写了熟悉git, 但其实只是简单使用过, 最多到checkout, 所以系统学习一下;
基于廖雪峰的网站 https://www.liaoxuefeng.com/wiki/896043488029600/896827951938304
Linus两周写完的, 牛!
more >>后天有个C++实习面试, 智能指针感觉挺爱问的, 刚好实现了一下, 做此纪录, 以备日后查看.
shared_ptr 会维护一个count, 每次新增加一个指向对象的指针, count + 1, 每次析构掉一个指针, count - 1; 当count == 0 的时候真正释放对象. 这一切都由shared_ptr帮你完成, 而不再需要手动delete;
