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数据库的定义	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E6%95%B0%E6%8D%AE%E5%BA%93%E7%9A%84%E5%AE%9A%E4%B9%89
什么是SQL？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%BB%80%E4%B9%88%E6%98%AFsql
什么是MySQL?	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%BB%80%E4%B9%88%E6%98%AFmysql
MySQL的架构	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E7%9A%84%E6%9E%B6%E6%9E%84
MySQL的binlog有有几种录入格式？分别有什么区别？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E7%9A%84binlog%E6%9C%89%E6%9C%89%E5%87%A0%E7%A7%8D%E5%BD%95%E5%85%A5%E6%A0%BC%E5%BC%8F%E5%88%86%E5%88%AB%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB
MySQL常用函数	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E5%B8%B8%E7%94%A8%E5%87%BD%E6%95%B0
聚合函数	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E8%81%9A%E5%90%88%E5%87%BD%E6%95%B0
数学函数	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E6%95%B0%E5%AD%A6%E5%87%BD%E6%95%B0
字符串函数	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%AD%97%E7%AC%A6%E4%B8%B2%E5%87%BD%E6%95%B0
日期和时间函数	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E6%97%A5%E6%9C%9F%E5%92%8C%E6%97%B6%E9%97%B4%E5%87%BD%E6%95%B0
条件判断函数	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E6%9D%A1%E4%BB%B6%E5%88%A4%E6%96%AD%E5%87%BD%E6%95%B0
系统信息函数	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E7%B3%BB%E7%BB%9F%E4%BF%A1%E6%81%AF%E5%87%BD%E6%95%B0
加密函数	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%8A%A0%E5%AF%86%E5%87%BD%E6%95%B0
索引	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E7%B4%A2%E5%BC%95
B+树索引和哈希索引的区别	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#b%E6%A0%91%E7%B4%A2%E5%BC%95%E5%92%8C%E5%93%88%E5%B8%8C%E7%B4%A2%E5%BC%95%E7%9A%84%E5%8C%BA%E5%88%AB
B树和B+树的区别	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#b%E6%A0%91%E5%92%8Cb%E6%A0%91%E7%9A%84%E5%8C%BA%E5%88%AB
聚集索引和辅助索引	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E8%81%9A%E9%9B%86%E7%B4%A2%E5%BC%95%E5%92%8C%E8%BE%85%E5%8A%A9%E7%B4%A2%E5%BC%95
聚集索引	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E8%81%9A%E9%9B%86%E7%B4%A2%E5%BC%95
辅助索引	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E8%BE%85%E5%8A%A9%E7%B4%A2%E5%BC%95
联合索引	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E8%81%94%E5%90%88%E7%B4%A2%E5%BC%95
什么情况下应不建或少建索引	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%BB%80%E4%B9%88%E6%83%85%E5%86%B5%E4%B8%8B%E5%BA%94%E4%B8%8D%E5%BB%BA%E6%88%96%E5%B0%91%E5%BB%BA%E7%B4%A2%E5%BC%95
哪些情况会导致索引失效？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%93%AA%E4%BA%9B%E6%83%85%E5%86%B5%E4%BC%9A%E5%AF%BC%E8%87%B4%E7%B4%A2%E5%BC%95%E5%A4%B1%E6%95%88
key和index的区别	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#key%E5%92%8Cindex%E7%9A%84%E5%8C%BA%E5%88%AB
如果索引值为null，走不走索引?	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%A6%82%E6%9E%9C%E7%B4%A2%E5%BC%95%E5%80%BC%E4%B8%BAnull%E8%B5%B0%E4%B8%8D%E8%B5%B0%E7%B4%A2%E5%BC%95
判断列是否要添加索引的标准	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%88%A4%E6%96%AD%E5%88%97%E6%98%AF%E5%90%A6%E8%A6%81%E6%B7%BB%E5%8A%A0%E7%B4%A2%E5%BC%95%E7%9A%84%E6%A0%87%E5%87%86
锁	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E9%94%81
行锁	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E8%A1%8C%E9%94%81
优点	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%BC%98%E7%82%B9
缺点	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E7%BC%BA%E7%82%B9
锁的算法	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E9%94%81%E7%9A%84%E7%AE%97%E6%B3%95
Record Lock	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#record-lock
Gap Lock	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#gap-lock
Next-Key Lock	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#next-key-lock
锁选择	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E9%94%81%E9%80%89%E6%8B%A9
悲观锁和乐观锁	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E6%82%B2%E8%A7%82%E9%94%81%E5%92%8C%E4%B9%90%E8%A7%82%E9%94%81
悲观锁和乐观锁使用在哪些场景？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E6%82%B2%E8%A7%82%E9%94%81%E5%92%8C%E4%B9%90%E8%A7%82%E9%94%81%E4%BD%BF%E7%94%A8%E5%9C%A8%E5%93%AA%E4%BA%9B%E5%9C%BA%E6%99%AF
乐观锁重试	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%B9%90%E8%A7%82%E9%94%81%E9%87%8D%E8%AF%95
数据库死锁的产生原因及解决办法	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E6%95%B0%E6%8D%AE%E5%BA%93%E6%AD%BB%E9%94%81%E7%9A%84%E4%BA%A7%E7%94%9F%E5%8E%9F%E5%9B%A0%E5%8F%8A%E8%A7%A3%E5%86%B3%E5%8A%9E%E6%B3%95
MySQL分区	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E5%88%86%E5%8C%BA
什么是分区？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%BB%80%E4%B9%88%E6%98%AF%E5%88%86%E5%8C%BA
分区与分表的区别	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%88%86%E5%8C%BA%E4%B8%8E%E5%88%86%E8%A1%A8%E7%9A%84%E5%8C%BA%E5%88%AB
使用场景	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%BD%BF%E7%94%A8%E5%9C%BA%E6%99%AF
限制	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E9%99%90%E5%88%B6
如何判断当前MySQL是否支持分区？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%A6%82%E4%BD%95%E5%88%A4%E6%96%AD%E5%BD%93%E5%89%8Dmysql%E6%98%AF%E5%90%A6%E6%94%AF%E6%8C%81%E5%88%86%E5%8C%BA
MySQL支持的分区类型有哪些？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E6%94%AF%E6%8C%81%E7%9A%84%E5%88%86%E5%8C%BA%E7%B1%BB%E5%9E%8B%E6%9C%89%E5%93%AA%E4%BA%9B
日志模块	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E6%97%A5%E5%BF%97%E6%A8%A1%E5%9D%97
redo log（重做日志）	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#redo-log%E9%87%8D%E5%81%9A%E6%97%A5%E5%BF%97
binlog（归档日志）	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#binlog%E5%BD%92%E6%A1%A3%E6%97%A5%E5%BF%97
两种日志区别	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%B8%A4%E7%A7%8D%E6%97%A5%E5%BF%97%E5%8C%BA%E5%88%AB
四种隔离级别	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%9B%9B%E7%A7%8D%E9%9A%94%E7%A6%BB%E7%BA%A7%E5%88%AB
MySQL的事务隔离级别的底层实现原理	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E7%9A%84%E4%BA%8B%E5%8A%A1%E9%9A%94%E7%A6%BB%E7%BA%A7%E5%88%AB%E7%9A%84%E5%BA%95%E5%B1%82%E5%AE%9E%E7%8E%B0%E5%8E%9F%E7%90%86
对于脏读，不可重复读，幻读的理解	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%AF%B9%E4%BA%8E%E8%84%8F%E8%AF%BB%E4%B8%8D%E5%8F%AF%E9%87%8D%E5%A4%8D%E8%AF%BB%E5%B9%BB%E8%AF%BB%E7%9A%84%E7%90%86%E8%A7%A3
脏读	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E8%84%8F%E8%AF%BB
不可重复读	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%B8%8D%E5%8F%AF%E9%87%8D%E5%A4%8D%E8%AF%BB
幻读	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%B9%BB%E8%AF%BB
不可重复读和幻读区别	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%B8%8D%E5%8F%AF%E9%87%8D%E5%A4%8D%E8%AF%BB%E5%92%8C%E5%B9%BB%E8%AF%BB%E5%8C%BA%E5%88%AB
InnoDB的RR级别如何避免幻读？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#innodb%E7%9A%84rr%E7%BA%A7%E5%88%AB%E5%A6%82%E4%BD%95%E9%81%BF%E5%85%8D%E5%B9%BB%E8%AF%BB
关于MVVC	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%85%B3%E4%BA%8Emvvc
存储过程	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%AD%98%E5%82%A8%E8%BF%87%E7%A8%8B
Mysql存储引擎	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E5%AD%98%E5%82%A8%E5%BC%95%E6%93%8E
MyISAM和InnoDB的区别	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#myisam%E5%92%8Cinnodb%E7%9A%84%E5%8C%BA%E5%88%AB
如何选择	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E5%A6%82%E4%BD%95%E9%80%89%E6%8B%A9
mysql主从同步	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E4%B8%BB%E4%BB%8E%E5%90%8C%E6%AD%A5
MySQL主从复制的两种方式	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E4%B8%BB%E4%BB%8E%E5%A4%8D%E5%88%B6%E7%9A%84%E4%B8%A4%E7%A7%8D%E6%96%B9%E5%BC%8F
使用主从同步的好处	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%BD%BF%E7%94%A8%E4%B8%BB%E4%BB%8E%E5%90%8C%E6%AD%A5%E7%9A%84%E5%A5%BD%E5%A4%84
主从复制原理	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%B8%BB%E4%BB%8E%E5%A4%8D%E5%88%B6%E5%8E%9F%E7%90%86
主从复制延迟及解决	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%B8%BB%E4%BB%8E%E5%A4%8D%E5%88%B6%E5%BB%B6%E8%BF%9F%E5%8F%8A%E8%A7%A3%E5%86%B3
MySQL事务原理	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E4%BA%8B%E5%8A%A1%E5%8E%9F%E7%90%86
undo 日志文件	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#undo-%E6%97%A5%E5%BF%97%E6%96%87%E4%BB%B6
redo/undo日志文件	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#redoundo%E6%97%A5%E5%BF%97%E6%96%87%E4%BB%B6
为什么用自增列作为主键	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%B8%BA%E4%BB%80%E4%B9%88%E7%94%A8%E8%87%AA%E5%A2%9E%E5%88%97%E4%BD%9C%E4%B8%BA%E4%B8%BB%E9%94%AE
Join的实现原理	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#join%E7%9A%84%E5%AE%9E%E7%8E%B0%E5%8E%9F%E7%90%86
优化	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%BC%98%E5%8C%96
MySQL优化	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E4%BC%98%E5%8C%96
一条sql执行过长的时间，你如何优化，从哪些方面？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%B8%80%E6%9D%A1sql%E6%89%A7%E8%A1%8C%E8%BF%87%E9%95%BF%E7%9A%84%E6%97%B6%E9%97%B4%E4%BD%A0%E5%A6%82%E4%BD%95%E4%BC%98%E5%8C%96%E4%BB%8E%E5%93%AA%E4%BA%9B%E6%96%B9%E9%9D%A2
MySQL中binary log和redo log顺序一致性问题	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E4%B8%ADbinary-log%E5%92%8Credo-log%E9%A1%BA%E5%BA%8F%E4%B8%80%E8%87%B4%E6%80%A7%E9%97%AE%E9%A2%98
一个表有3000万记录，假如有一列占8位字节的字段，根据这一列建索引的话索引树的高度是多少？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%B8%80%E4%B8%AA%E8%A1%A8%E6%9C%893000%E4%B8%87%E8%AE%B0%E5%BD%95%E5%81%87%E5%A6%82%E6%9C%89%E4%B8%80%E5%88%97%E5%8D%A08%E4%BD%8D%E5%AD%97%E8%8A%82%E7%9A%84%E5%AD%97%E6%AE%B5%E6%A0%B9%E6%8D%AE%E8%BF%99%E4%B8%80%E5%88%97%E5%BB%BA%E7%B4%A2%E5%BC%95%E7%9A%84%E8%AF%9D%E7%B4%A2%E5%BC%95%E6%A0%91%E7%9A%84%E9%AB%98%E5%BA%A6%E6%98%AF%E5%A4%9A%E5%B0%91
b+树一般多高，能存储多少数据？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#b%E6%A0%91%E4%B8%80%E8%88%AC%E5%A4%9A%E9%AB%98%E8%83%BD%E5%AD%98%E5%82%A8%E5%A4%9A%E5%B0%91%E6%95%B0%E6%8D%AE
为什么要给表加上主键？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E7%BB%99%E8%A1%A8%E5%8A%A0%E4%B8%8A%E4%B8%BB%E9%94%AE
为何要使用自增int作为主键？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E4%B8%BA%E4%BD%95%E8%A6%81%E4%BD%BF%E7%94%A8%E8%87%AA%E5%A2%9Eint%E4%BD%9C%E4%B8%BA%E4%B8%BB%E9%94%AE
MySQL中sql注入是什么，如何避免？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql%E4%B8%ADsql%E6%B3%A8%E5%85%A5%E6%98%AF%E4%BB%80%E4%B9%88%E5%A6%82%E4%BD%95%E9%81%BF%E5%85%8D
SQL中where、having、group by、order by执行和书写顺序？	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#sql%E4%B8%ADwherehavinggroup-byorder-by%E6%89%A7%E8%A1%8C%E5%92%8C%E4%B9%A6%E5%86%99%E9%A1%BA%E5%BA%8F
水平分库后查询如何排序	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#%E6%B0%B4%E5%B9%B3%E5%88%86%E5%BA%93%E5%90%8E%E6%9F%A5%E8%AF%A2%E5%A6%82%E4%BD%95%E6%8E%92%E5%BA%8F
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#数据库基础知识
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#数据库的定义
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#什么是sql
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#什么是mysql
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql的架构
	https://github.com/zaiyunduan123/Java-Interview/blob/master/image/MySQL-8.png
	https://github.com/zaiyunduan123/Java-Interview/blob/master/image/MySQL-9.png
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql的binlog有有几种录入格式分别有什么区别
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql常用函数
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#聚合函数
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#数学函数
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#字符串函数
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#日期和时间函数
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#条件判断函数
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#系统信息函数
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#加密函数
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#索引
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#b树索引和哈希索引的区别
	https://github.com/zaiyunduan123/Java-Interview/blob/master/image/MySQL-1.jpg
	https://github.com/zaiyunduan123/Java-Interview/blob/master/image/MySQL-2.jpg
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#b树和b树的区别
	https://github.com/zaiyunduan123/Java-Interview/blob/master/image/MySQL-3.jpg
	https://github.com/zaiyunduan123/Java-Interview/blob/master/image/MySQL-4.jpg
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#聚集索引和辅助索引
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#聚集索引
	https://github.com/zaiyunduan123/Java-Interview/blob/master/image/MySQL-6.png
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#辅助索引
	https://github.com/zaiyunduan123/Java-Interview/blob/master/image/MySQL-7.png
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#联合索引
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#什么情况下应不建或少建索引
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#哪些情况会导致索引失效
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#key和index的区别
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#如果索引值为null走不走索引
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#判断列是否要添加索引的标准
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#锁
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#行锁
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#优点
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#缺点
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#锁的算法
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#record-lock
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#gap-lock
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#next-key-lock
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#锁选择
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#悲观锁和乐观锁
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#悲观锁和乐观锁使用在哪些场景
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#乐观锁重试
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#数据库死锁的产生原因及解决办法
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql分区
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#什么是分区
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#分区与分表的区别
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#使用场景
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#限制
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#如何判断当前mysql是否支持分区
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql支持的分区类型有哪些
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#日志模块
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#redo-log重做日志
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#binlog归档日志
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#两种日志区别
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#四种隔离级别
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql的事务隔离级别的底层实现原理
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#对于脏读不可重复读幻读的理解
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#脏读
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#不可重复读
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#幻读
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#不可重复读和幻读区别
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#innodb的rr级别如何避免幻读
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#关于mvvc
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#存储过程
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql存储引擎
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#myisam和innodb的区别
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#如何选择
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql主从同步
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql主从复制的两种方式
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#使用主从同步的好处
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#主从复制原理
	https://github.com/zaiyunduan123/Java-Interview/blob/master/image/MySQL-5.jpg
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#主从复制延迟及解决
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql事务原理
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#undo-日志文件
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#redoundo日志文件
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#为什么用自增列作为主键
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#join的实现原理
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#优化
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql优化
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#一条sql执行过长的时间你如何优化从哪些方面
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql中binary-log和redo-log顺序一致性问题
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#一个表有3000万记录假如有一列占8位字节的字段根据这一列建索引的话索引树的高度是多少
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#b树一般多高能存储多少数据
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#为什么要给表加上主键
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#为何要使用自增int作为主键
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#mysql中sql注入是什么如何避免
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#sql中wherehavinggroup-byorder-by执行和书写顺序
	https://github.com/codecodeabc/Java-Summarize/blob/master/notes/database/MySQL.md#水平分库后查询如何排序
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