Test Driven Development: what it is, and what it is not.
basic concept unit test; integration test unit: small piece of code integration test a gropu of unit TTD test driven development
write test implement the code Refactor test first development:
先写单元测试，再实现具体逻辑，再重构 以单元测试作为驱动；
test sql sql mock real test testMain 1 2 3 4 5 6 7 func TestMain(m *testing.M) { log.Println("Do stuff BEFORE the tests!") exitVal := m.Run() log.Println("Do stuff AFTER the tests!
Linux的内存分页管理
Virtual Memory
Writing a Memory Allocator
memory layout initialized data(data): global/static Uninitialized Data Segment: gloabl/static 虚拟内存 操作系统对物理内存做了屏蔽，进程只能访问到虚拟内存
; mmu(memory management unit) 再通过page table 将虚拟内存地址转换成物理内存地址
分页 为什么 如果不分页，那么 page table 将特别大； 如何 getconf PAGE_SIZE 一般每页为4kb；也即是内存管理的最小单位 转换(翻译)过程 通过编号+偏移量进行住转换
3. io 磁盘IO瓶颈
1. summary 1. throughput throughput: the total size of read/write operations per second IOPS: the time of read/write operations per second
Throughput = IOPS x block size
程序访问是虚拟内存地址，操作系统会将虚拟内存地址映射物理内存地址;
为提高物理内存查找效率，将虚拟内存和物理内存分成页，（4kb~16kb）
虚拟内存通过page map 映射成对应物理内存地址 常见的内存分配 TCMalloc解密
数据库索引为什么使用B+树？
MySQL索引背后的数据结构及算法原理
1分钟了解MyISAM与InnoDB的索引差异
Introduction of B-Tree
我必须得告诉大家的MySQL优化原理
万字总结：学习MySQL优化原理，这一篇就够了！
MySQL索引原理及BTree（B-/+Tree）结构详解
Understanding MySQL EXPLAIN
一篇文章让你搞懂Mysql InnoDB内存结构
Indexing and Query Processing
MySQL索引原理及慢查询优化
MySQL redo & undo log-这一篇就够了
Surrogate Key vs Natural Key Differences and When to Use in SQL Server
Surrogate Key in SQL Server
小胖问我：MySQL 事务与 MVCC 原理？
数据库基础（四）Innodb MVCC实现原理
MySQL gap lock, next key lock by example
MySQL的锁机制 - 记录锁、间隙锁、临键锁
MySQL探秘(七):InnoDB行锁算法
手把手教你分析Mysql死锁问题
完全掌握MySQL原理篇之InnoDB存储引擎架构设计
简单谈谈MySQL的两阶段提交
MySQL - order by 出现 using filesort根因分析及优化
The Four Stages of Compiling a C Program
Introduction of Compiler Design 走进Golang之编译器原理
目标文件里面到底有什么(1)？ Go: Overview of the Compiler 【Linux】编译,链接,装载简单梳理 Go 程序是怎样跑起来的 我需要知道：编译、链接、装载、运行 程序的编译、链接、装载与运行 Compiler Architecture 1 What is a Compiler?
编译过程 （以c语言为例） hello.c
1 2 3 4 5 6 7 8 9 10 11 12 /* * "Hello, World!": A classic. */ #include <stdio.h> int main(void) { puts("Hello, World!"); return 0; } 预编译: 处理预编译指令； 导入 # include 引用的声明代码 移除注释 1 2 3 4 5 6 7 8 9 10 11 12 [lines omitted for brevity] extern int __vsnprintf_chk (char * restrict, size_t, int, size_t, const char * restrict, va_list); # 493 "/usr/include/stdio.
牙齿主要疾病:
蛀牙； 牙周病 structure:
根管治疗: 杀死神经
why: 血管已经被感染
how: 打开牙髓腔 注入药物杀死神经 填充 牙套保护
what: Meditation is a practice in which someone focusing the mind on a particular object, thought, or activity – to train attention and awareness
benefit:
helps increase your focus and attention keep inner peace. why is it so powerful: cause the shifts in our awareness, It is important to recognize that we are not our thoughts and feelings. Habitual meditation helps us realize that we are just the vessels through which they flow.
