分布式合集，杂乱

1、redis,什么是分布式锁

https://www.jianshu.com/p/a1ebab8ce78a

2、mysql高效插入数据

https://www.cnblogs.com/dailidong/p/7571074.html

3、时间复杂度和空间复杂度

https://blog.csdn.net/haha223545/article/details/93619874

4、sql优化的几种方式

https://blog.csdn.net/qq_38789941/article/details/83744271

5、springboot入门学习

http://www.ityouknow.com/springboot/2016/01/06/spring-boot-quick-start.html

6、2020面试题精选

https://zhuanlan.zhihu.com/p/64147696

7、java笔试题网站

https://www.nowcoder.com/test/question/done?tid=35272846&qid=3285#summary